blabla/PATSTAT/CPC_data/CPCSchemeXML202302/cpc-scheme-E21D.xml

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<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="E21D" definition-exists="true" date-revised="2018-08-01" status="published"><classification-symbol>E21D</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>SHAFTS</text></title-part><title-part><text>TUNNELS</text></title-part><title-part><text>GALLERIES</text></title-part><title-part><text>LARGE UNDERGROUND CHAMBERS </text><reference><text>soil-conditioning or soil-stabilising materials <class-ref scheme="cpc">C09K17/00</class-ref>; drilling or cutting machines for mining or quarrying <class-ref scheme="cpc">E21C</class-ref>; safety devices, transport, rescue, ventilation or drainage <class-ref scheme="cpc">E21F</class-ref></text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="warning"><note-paragraph warning-type="ipc-not-used">The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups: <table><row><entry><class-ref scheme="ipc">E21D13/02</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">E21D13/00</class-ref></entry></row><row><entry><class-ref scheme="ipc">E21D13/04</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">E21D13/00</class-ref></entry></row><row><entry><class-ref scheme="ipc">E21D15/582</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">E21D15/58</class-ref></entry></row><row><entry><class-ref scheme="ipc">E21D15/59</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">E21D15/44</class-ref>, <class-ref scheme="cpc">E21D15/58</class-ref></entry></row><row><entry><class-ref scheme="ipc">E21D17/022</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">E21D17/02</class-ref></entry></row><row><entry><class-ref scheme="ipc">E21D17/05</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">E21D17/0206</class-ref>, <class-ref scheme="cpc">E21D17/04</class-ref></entry></row><row><entry><class-ref scheme="ipc">E21D17/054</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">E21D17/04</class-ref></entry></row><row><entry><class-ref scheme="ipc">E21D19/06</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">E21D19/02</class-ref>, <class-ref scheme="cpc">E21D19/04</class-ref></entry></row></table></note-paragraph><note-paragraph>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="E21D1/00" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Shafts</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D1/00" definition-exists="true" ipc-concordant="E21D1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sinking shafts</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D1/02" definition-exists="false" ipc-concordant="E21D1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by hand</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D1/03" definition-exists="false" ipc-concordant="E21D1/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>mechanically, </text><CPC-specific-text><text>e.g. by loading shovels or loading buckets, scraping devices, conveying screws</text></CPC-specific-text><reference><text><class-ref scheme="cpc">E21D1/08</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D1/04" definition-exists="false" ipc-concordant="E21D1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with grabs </text><CPC-specific-text><reference><text>boring grabs <class-ref scheme="cpc">E21D1/04</class-ref>, <class-ref scheme="cpc">E21B27/00</class-ref>; grab buckets for digging in general <class-ref scheme="cpc">E02F3/47</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D1/06" definition-exists="false" ipc-concordant="E21D1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with shaft-boring cutters </text><reference><text>drilling machines <class-ref scheme="cpc">E21B</class-ref>, <class-ref scheme="cpc">E21C</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D1/08" definition-exists="false" ipc-concordant="E21D1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>while moving the lining downwards </text><CPC-specific-text><reference><text>lowering the lining into a ready shaft <class-ref scheme="cpc">E21D5/01</class-ref>; sheet piles <class-ref scheme="cpc">E02D5/02</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D1/10" definition-exists="false" ipc-concordant="E21D1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Preparation of the ground </text><CPC-specific-text><reference><text>for galleries or tunnels <class-ref scheme="cpc">E21D9/001</class-ref>; improving or preserving foundation soil or rock <class-ref scheme="cpc">E02D3/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D1/105" definition-exists="false" ipc-concordant="E21D1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by water level modification</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D1/12" definition-exists="false" ipc-concordant="E21D1/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by freezing </text><CPC-specific-text><reference><text>freezing of foundation soil <class-ref scheme="cpc">E02D3/115</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D1/14" definition-exists="false" ipc-concordant="E21D1/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D1/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Freezing apparatus</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D1/16" definition-exists="false" ipc-concordant="E21D1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>E21D1/16</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>by petrification </text><reference><text>grouting anchoring-bolts <class-ref scheme="cpc">E21D20/02</class-ref>  </text><CPC-specific-text><text>; consolidating foundation soil by placing solidifying or pore-filling substances in the soil <class-ref scheme="cpc">E02D3/12</class-ref></text></CPC-specific-text></reference></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D3/00" definition-exists="true" ipc-concordant="E21D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Raising shafts, i.e. working upwards from the bottom</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D5/00" definition-exists="true" ipc-concordant="E21D5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>E21D5/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Lining shafts</text></title-part><title-part><text>Linings therefor </text><reference><text><class-ref scheme="cpc">E21D11/00</class-ref> takes precedence </text><CPC-specific-text><text>; sinking with simultaneous lowering of the lining <class-ref scheme="cpc">E21D1/08</class-ref></text></CPC-specific-text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D5/01" definition-exists="false" ipc-concordant="E21D5/01" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using prefabricated lining lowered into a hole filled with liquid or viscous mass</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D5/012" definition-exists="false" ipc-concordant="E21D5/012" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/012</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Use of fluid-tight or anti-friction material on outside of, or between, lining layers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D5/016" definition-exists="false" ipc-concordant="E21D5/016" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/016</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bearer curbs</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D5/02" definition-exists="false" ipc-concordant="E21D5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with wood </text><reference><text><class-ref scheme="cpc">E21D5/01</class-ref>, <class-ref scheme="cpc">E21D5/012</class-ref>, <class-ref scheme="cpc">E21D5/016</class-ref> take precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D5/04" definition-exists="false" ipc-concordant="E21D5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with brick, concrete, stone, or similar building materials </text><reference><text><class-ref scheme="cpc">E21D5/01</class-ref>, <class-ref scheme="cpc">E21D5/012</class-ref>, <class-ref scheme="cpc">E21D5/016</class-ref> take precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D5/06" definition-exists="false" ipc-concordant="E21D5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with iron or steel </text><reference><text><class-ref scheme="cpc">E21D5/01</class-ref>, <class-ref scheme="cpc">E21D5/012</class-ref>, <class-ref scheme="cpc">E21D5/016</class-ref> take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D5/08" definition-exists="false" ipc-concordant="E21D5/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in the form of profiled parts</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D5/10" definition-exists="false" ipc-concordant="E21D5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in the form of tubbing </text><CPC-specific-text><text>or of rings composed of profile elements</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D5/11" definition-exists="false" ipc-concordant="E21D5/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with combinations of different materials, e.g. wood, metal, concrete </text><reference><text><class-ref scheme="cpc">E21D5/01</class-ref>, <class-ref scheme="cpc">E21D5/012</class-ref>, <class-ref scheme="cpc">E21D5/016</class-ref> take precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D5/12" definition-exists="false" ipc-concordant="E21D5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D5/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Accessories for making shaft linings, e.g. suspended cradles, shutterings</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D7/00" definition-exists="true" ipc-concordant="E21D7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>E21D7/00</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Shaft equipment, e.g. timbering within the shaft </text><CPC-specific-text><reference><text>lifts in hoistways or mines <class-ref scheme="cpc">B66B15/00</class-ref>&#160;-&#160;<class-ref scheme="cpc">B66B19/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D7/005" definition-exists="false" ipc-concordant="E21D7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D7/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Determination of shaft lining deformation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D7/02" definition-exists="false" ipc-concordant="E21D7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangement of guides for cages in shafts</text></title-part><title-part><text>Connection of guides for cages to shaft walls </text><reference><text>guideways or guides for elevators <class-ref scheme="cpc">B66B7/02</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D8/00" definition-exists="true" ipc-concordant="E21D8/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>E21D8/00</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Shafts not provided for in groups <class-ref scheme="cpc">E21D1/00</class-ref>&#160;-&#160;<class-ref scheme="cpc">E21D7/00</class-ref></text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="E21D9/00" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Tunnels</text></title-part><title-part><text>Galleries</text></title-part><title-part><text>Large underground chambers</text></title-part><title-part><text>Linings therefor </text><reference><text>galleries protecting against falling rocks or avalanches <class-ref scheme="cpc">E01F7/04</class-ref>; pressure galleries, galleries specially adapted to house pressure water conduits <class-ref scheme="cpc">E02B9/06</class-ref>; tunnels or galleries specially adapted to house conduits in general <class-ref scheme="cpc">E02D29/10</class-ref>; sewers <class-ref scheme="cpc">E03F</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D9/00" definition-exists="true" ipc-concordant="E21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Tunnels or galleries, with or without linings</text></title-part><title-part><text>Methods or apparatus for making thereof </text><reference><text><class-ref scheme="cpc">E02D29/045</class-ref>, <class-ref scheme="cpc">E02D29/063</class-ref> take precedence; linings <u>per se</u> <class-ref scheme="cpc">E21D11/00</class-ref></text></reference></title-part><title-part><text>Layout of tunnels or galleries</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/001" definition-exists="false" ipc-concordant="E21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Improving soil or rock, e.g. by freezing; Injections </text><reference><text>for sinking shafts <class-ref scheme="cpc">E21D1/10</class-ref>; injection of liquids for binding dust <class-ref scheme="cpc">E21F5/18</class-ref>; improving or preserving foundation soil or rock <class-ref scheme="cpc">E02D3/00</class-ref>; borehole closures, i.e. packers, for use during the injection process <class-ref scheme="cpc">E21B33/12</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/002" definition-exists="false" ipc-concordant="E21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Injection methods characterised by the chemical composition used</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/003" definition-exists="false" ipc-concordant="E21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/004" definition-exists="false" ipc-concordant="E21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using light beams for direction or position control</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/005" definition-exists="false" ipc-concordant="E21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by forcing prefabricated elements through the ground, e.g. by pushing lining from an access pit </text><reference><text>driving shields <class-ref scheme="cpc">E21D9/06</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/006" definition-exists="false" ipc-concordant="E21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by making use of blasting methods </text><reference><text>explosive compositions <class-ref scheme="cpc">C06B</class-ref>; blasting <u>per se</u> <class-ref scheme="cpc">F42</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/008" definition-exists="false" ipc-concordant="E21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/008</classification-symbol><class-title><title-part><CPC-specific-text><text>Driving transverse tunnels starting from existing tunnels</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/01" definition-exists="false" ipc-concordant="E21D9/01" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/01</classification-symbol><class-title><title-part><text>Methods or apparatus for enlarging or restoring the cross-section of tunnels, e.g. by restoring the floor to its original level</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/02" definition-exists="false" ipc-concordant="E21D9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Driving inclined tunnels or galleries</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/03" definition-exists="false" ipc-concordant="E21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/03</classification-symbol><class-title><title-part><CPC-specific-text><text>Driving non-circular tunnels</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/04" definition-exists="false" ipc-concordant="E21D9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Driving tunnels or galleries through loose materials</text></title-part><title-part><text>Apparatus therefor not otherwise provided for </text><CPC-specific-text><reference><text><class-ref scheme="cpc">E21D9/005</class-ref>, <class-ref scheme="cpc">E21D9/06</class-ref> take precedence; soil improvement <class-ref scheme="cpc">E21D9/001</class-ref>; provisional protective covers <class-ref scheme="cpc">E21D19/04</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/06" definition-exists="true" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>E21D9/06</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Making by using a driving shield </text><CPC-specific-text><text>, i.e. advanced by pushing means bearing against the already placed lining </text><reference><text>pushing prefabricated elements through the ground from an access pit <class-ref scheme="cpc">E21D9/005</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/0607" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0607</classification-symbol><class-title date-revised="2016-01-01"><title-part><CPC-specific-text><text>the shield being provided with devices for lining the tunnel, e.g. shuttering </text><reference><text><class-ref scheme="cpc">E21D9/0873</class-ref>, <class-ref scheme="cpc">E21D9/0879</class-ref> take precedence; tail sealing means used as end shuttering <class-ref scheme="cpc">E21D9/0635</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/0609" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0609</classification-symbol><class-title><title-part><CPC-specific-text><text>with means for applying a continuous liner, e.g. sheets of plastics, between the main concrete lining and the rock</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/0621" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/0621</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Shield advancing devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/0635" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/0635</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tail sealing means, e.g. used as end shuttering</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/0642" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0642</classification-symbol><class-title><title-part><CPC-specific-text><text>the shield having means for additional processing at the front end</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/065" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/065</classification-symbol><class-title><title-part><CPC-specific-text><text>with devices for provisionally supporting the front face</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/0657" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0657</classification-symbol><class-title><title-part><CPC-specific-text><text>structurally associated with rock crushers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/0664" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0664</classification-symbol><class-title><title-part><CPC-specific-text><text>with means for applying a coating layer to the front face, e.g. by spraying</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/0671" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0671</classification-symbol><class-title><title-part><CPC-specific-text><text>with means for consolidating the rock in front of the shield by injection of consolidating substances through boreholes</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/0678" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0678</classification-symbol><class-title date-revised="2016-01-01"><title-part><CPC-specific-text><text>Adding additives, e.g. chemical compositions, to the slurry or the cuttings</text></CPC-specific-text></title-part></class-title><notes-and-warnings><note type="note"><note-paragraph>When classifying in this group, bentonite shall not be classified</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/0685" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0685</classification-symbol><class-title><title-part><CPC-specific-text><text>Foaming agents</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/0692" definition-exists="false" ipc-concordant="E21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/0692</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cutter drive shields</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/08" definition-exists="false" ipc-concordant="E21D9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with additional boring or cutting means </text><CPC-specific-text><text>other than the conventional cutting edge of the shield</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/087" definition-exists="false" ipc-concordant="E21D9/087" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/087</classification-symbol><class-title><title-part><text>with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/0873" definition-exists="false" ipc-concordant="E21D9/087" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0873</classification-symbol><class-title><title-part><CPC-specific-text><text>the shield being provided with devices for lining the tunnel, e.g. shuttering</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/0874" definition-exists="false" ipc-concordant="E21D9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0874</classification-symbol><class-title><title-part><CPC-specific-text><text>with rotary drilling heads having variable diameter</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/0875" definition-exists="false" ipc-concordant="E21D9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0875</classification-symbol><class-title><title-part><CPC-specific-text><text>with a movable support arm carrying cutting tools for attacking the front face, e.g. a bucket</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/0879" definition-exists="false" ipc-concordant="E21D9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/0879</classification-symbol><class-title><title-part><CPC-specific-text><text>the shield being provided with devices for lining the tunnel, e.g. shuttering</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/093" definition-exists="false" ipc-concordant="E21D9/093" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D9/093</classification-symbol><class-title><title-part><text>Control of the driving shield </text><CPC-specific-text><text>, e.g. of the hydraulic advancing cylinders </text><reference><text>arrangement of measuring or indicating devices for use during driving of tunnels <class-ref scheme="cpc">E21D9/003</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/10" definition-exists="true" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Making by using boring or cutting machines </text><reference><text><class-ref scheme="cpc">E21D9/08</class-ref> takes precedence; mining picks <class-ref scheme="cpc">E21C35/18</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/1006" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with rotary cutting tools </text><reference><text>for cutting simultaneously the whole cross-section <class-ref scheme="cpc">E21D9/11</class-ref>; drill bits <class-ref scheme="cpc">E21B10/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/1013" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1013</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>on a tool-carrier supported by a movable boom</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/102" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/102</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by a longitudinally extending boom being pivotable about a vertical and a transverse axis</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="E21D9/1026" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the tool-carrier being rotated about a transverse axis</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/1033" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1033</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by a transversely extending boom being pivotable about a longitudinal axis</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/104" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/104</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cutting tool fixtures </text><reference><text>devices with percussive tools <class-ref scheme="cpc">E21D9/106</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/1046" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Vibrating</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/1053" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1053</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for making a slit along the perimeter of the tunnel profile, the remaining core being removed subsequently, e.g. by blasting</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/106" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/106</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with percussive tools, e.g. pick-hammers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/1066" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with fluid jets </text><reference><text>projecting hot gases <class-ref scheme="cpc">E21D9/1073</class-ref>; drilling by liquid or gas jets <class-ref scheme="cpc">E21B7/18</class-ref>; slitting by liquid jets <class-ref scheme="cpc">E21C25/60</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/1073" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1073</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>applying thermal energy, e.g. by projecting flames or hot gases, by laser beams </text><reference><text>flame drilling <class-ref scheme="cpc">E21B7/14</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/108" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/108</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Remote control specially adapted for machines for driving tunnels or galleries </text><reference><text>for machines for slitting or completely freeing the mineral <class-ref scheme="cpc">E21C35/24</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/1086" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Drives or transmissions specially adapted therefor</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/1093" definition-exists="false" ipc-concordant="E21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/1093</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Devices for supporting, advancing or orientating the machine or the tool-carrier </text><reference><text>measuring devices for guiding machines <class-ref scheme="cpc">E21D9/003</class-ref>; anchoring in the borehole <class-ref scheme="cpc">E21B4/18</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/11" definition-exists="false" ipc-concordant="E21D9/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/11</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/111" definition-exists="false" ipc-concordant="E21D9/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/111</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of heads or tool-carrying sectors implementing an oscillating rotary motion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/112" definition-exists="false" ipc-concordant="E21D9/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/112</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of one single rotary head or of concentric rotary heads </text><reference><text><class-ref scheme="cpc">E21D9/111</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/113" definition-exists="false" ipc-concordant="E21D9/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/113</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a central part for making a pilot tunnel and a follow-up part for enlarging the pilot tunnel </text><reference><text><class-ref scheme="cpc">E21D9/115</class-ref> takes precedence; similar apparatus for enlarging drilled boreholes <class-ref scheme="cpc">E21B7/28</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/115" definition-exists="false" ipc-concordant="E21D9/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/115</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with cutting tools mounted pivotably or slidable on the head</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/116" definition-exists="false" ipc-concordant="E21D9/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/116</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of non-concentric rotary heads </text><reference><text><class-ref scheme="cpc">E21D9/111</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/117" definition-exists="false" ipc-concordant="E21D9/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/117</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>mounted for orientating or sideways shifting relative to the frame</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D9/118" definition-exists="false" ipc-concordant="E21D9/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/118</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with independently driven central head</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/12" definition-exists="false" ipc-concordant="E21D9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Devices for removing or hauling away excavated material or spoil</text></title-part><title-part><text>Working or loading platforms </text><reference><text>underground transport <class-ref scheme="cpc">E21F13/00</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/122" definition-exists="false" ipc-concordant="E21D9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/122</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Working or loading platforms </text><reference><text>underground transport <class-ref scheme="cpc">E21F13/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/124" definition-exists="false" ipc-concordant="E21D9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/124</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Helical conveying means therefor </text><reference><text><class-ref scheme="cpc">E21D9/13</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/126" definition-exists="false" ipc-concordant="E21D9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/126</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Loading devices or installations </text><reference><text>loading platforms <class-ref scheme="cpc">E21D9/122</class-ref>; soil-shifting machines <class-ref scheme="cpc">E02F3/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D9/128" definition-exists="false" ipc-concordant="E21D9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>E21D9/128</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>Loader-conveyors with gathering arms</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D9/13" definition-exists="false" ipc-concordant="E21D9/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/13</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using hydraulic or pneumatic conveying means</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D9/14" definition-exists="false" ipc-concordant="E21D9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D9/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Layout of tunnels or galleries</text></title-part><title-part><text>Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D11/00" definition-exists="true" ipc-concordant="E21D11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>E21D11/00</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Lining tunnels, galleries or other underground cavities, e.g. large underground chambers</text></title-part><title-part><text>Linings therefor</text></title-part><title-part><text>Making such linings <u>in situ</u>, e.g. by assembling </text><reference><text><class-ref scheme="cpc">E21D15/00</class-ref>&#160;-&#160;<class-ref scheme="cpc">E21D23/00</class-ref> take precedence; specially for shafts <class-ref scheme="cpc">E21D5/00</class-ref>; </text><CPC-specific-text><text>driving shields in combination with means for lining the tunnel <class-ref scheme="cpc">E21D9/06</class-ref></text></CPC-specific-text><text>; lining pressure water galleries, linings therefor <class-ref scheme="cpc">E02B9/06</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D11/003" definition-exists="false" ipc-concordant="E21D11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices </text><reference><text><class-ref scheme="cpc">E21D11/38</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D11/006" definition-exists="false" ipc-concordant="E21D11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Lining anchored in the rock </text><reference><text>setting anchoring-bolts <class-ref scheme="cpc">E21D20/00</class-ref>; anchoring-bolts <class-ref scheme="cpc">E21D21/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D11/02" definition-exists="false" ipc-concordant="E21D11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Lining predominantly with wood</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/03" definition-exists="false" ipc-concordant="E21D11/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using timber- setting machines</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D11/04" definition-exists="false" ipc-concordant="E21D11/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>E21D11/04</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Lining with building materials </text><reference><text><class-ref scheme="cpc">E21D11/02</class-ref>, <class-ref scheme="cpc">E21D11/14</class-ref> take precedence </text><CPC-specific-text><text>; compositions of mortars, concrete or like building materials <class-ref scheme="cpc">C04B</class-ref>; placing filling-up materials in underground workings <class-ref scheme="cpc">E21F15/00</class-ref></text></CPC-specific-text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/05" definition-exists="false" ipc-concordant="E21D11/05" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/05</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using compressible insertions</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/06" definition-exists="false" ipc-concordant="E21D11/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with bricks</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/07" definition-exists="false" ipc-concordant="E21D11/07" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using brick- laying machines </text><CPC-specific-text><reference><text>brick-laying machines <u>per se</u> <class-ref scheme="cpc">E04G21/22</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/08" definition-exists="false" ipc-concordant="E21D11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with preformed concrete slabs </text><CPC-specific-text><reference><text>backfilling the space between the slabs and the rock <class-ref scheme="cpc">E21D11/105</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/083" definition-exists="false" ipc-concordant="E21D11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/083</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Methods or devices for joining adjacent concrete segments</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/086" definition-exists="false" ipc-concordant="E21D11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D11/086</classification-symbol><class-title><title-part><CPC-specific-text><text>Methods of making concrete lining segments</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/10" definition-exists="false" ipc-concordant="E21D11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with concrete cast <u>in situ</u></text></title-part><title-part><text>Shuttering </text><CPC-specific-text><text>also lost shutterings, e.g. made of blocks, of metal plates</text></CPC-specific-text><text> or other equipment adapted therefor</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/102" definition-exists="false" ipc-concordant="E21D11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/102</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Removable shuttering; Bearing or supporting devices therefor</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/105" definition-exists="false" ipc-concordant="E21D11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transport or application of concrete specially adapted for the lining of tunnels or galleries </text><reference><text>in building <class-ref scheme="cpc">E04F21/08</class-ref>, <class-ref scheme="cpc">E04G21/02</class-ref></text></reference><text>; Backfilling the space between main building element and the surrounding rock, e.g. with concrete</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/107" definition-exists="false" ipc-concordant="E21D11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/107</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reinforcing elements therefor; Holders for the reinforcing elements</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/12" definition-exists="false" ipc-concordant="E21D11/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Temporary supports for use during building </text><CPC-specific-text><reference><text>removable shutterings <class-ref scheme="cpc">E21D11/102</class-ref></text></reference></CPC-specific-text></title-part><title-part><text>Accessories </text><CPC-specific-text><reference><text>provisional protective covers <class-ref scheme="cpc">E21D19/04</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D11/14" definition-exists="false" ipc-concordant="E21D11/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Lining predominantly with metal </text><CPC-specific-text><reference><text>backfilling the space between the lining elements and the rock <class-ref scheme="cpc">E21D11/105</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/15" definition-exists="false" ipc-concordant="E21D11/15" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/15</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Plate linings</text></title-part><title-part><text>Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members </text><reference><text>insulation <class-ref scheme="cpc">E21D11/38</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/152" definition-exists="false" ipc-concordant="E21D11/15" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/152</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Laggings made of grids or nettings</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/155" definition-exists="false" ipc-concordant="E21D11/15" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/155</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Laggings made of strips, slats, slabs or sheet piles </text><reference><text>longitudinal struts for mine arches <class-ref scheme="cpc">E21D11/28</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/157" definition-exists="false" ipc-concordant="E21D11/15" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/157</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Laggings making use of fluid cushions, e.g. the fluid containing a hardenable material </text><reference><text>chocks made of flexible containers <class-ref scheme="cpc">E21D15/483</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/18" definition-exists="false" ipc-concordant="E21D11/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>E21D11/18</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Arch members </text><CPC-specific-text><text>; Network made of arch members </text><reference><text><class-ref scheme="cpc">E21D11/36</class-ref> takes precedence</text></reference><text>; Ring elements; Polygon elements; Polygon elements inside arches </text><reference><text>caps for arches <class-ref scheme="cpc">E21D17/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/183" definition-exists="false" ipc-concordant="E21D11/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/183</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Supporting means for arch members, not provided for in <class-ref scheme="cpc">E21D11/22</class-ref></text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/186" definition-exists="false" ipc-concordant="E21D11/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/186</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pre-stressing or dismantling devices therefor</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/20" definition-exists="false" ipc-concordant="E21D11/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Special cross- sections, e.g. corrugated </text><CPC-specific-text><reference><text>for props <class-ref scheme="cpc">E21D15/502</class-ref>; for caps <class-ref scheme="cpc">E21D17/01</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/22" definition-exists="false" ipc-concordant="E21D11/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Clamps or other yieldable means for interconnecting adjacent arch members either rigidly, or allowing arch member parts to slide when subjected to excessive pressure</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/24" definition-exists="false" ipc-concordant="E21D11/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Knuckle joints or links between arch members</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/26" definition-exists="false" ipc-concordant="E21D11/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Shoes for connecting arch members to longitudinal struts</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/28" definition-exists="false" ipc-concordant="E21D11/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>E21D11/28</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Longitudinal struts </text><CPC-specific-text><text>, i.e. longitudinal connections between adjoining arches</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/30" definition-exists="false" ipc-concordant="E21D11/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bases for lower arch members </text><reference><text>for props <class-ref scheme="cpc">E21D15/54</class-ref></text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/34" definition-exists="false" ipc-concordant="E21D11/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>E21D11/34</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Joints between vertical props and horizontal top bars </text><reference><text>end caps forming part of the props <class-ref scheme="cpc">E21D15/54</class-ref>  </text><CPC-specific-text><text>; retaining plates on caps for engaging the tops of pit-props <class-ref scheme="cpc">E21D17/10</class-ref></text></CPC-specific-text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/36" definition-exists="false" ipc-concordant="E21D11/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Linings or supports specially shaped for tunnels or galleries of irregular cross-section</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/362" definition-exists="false" ipc-concordant="E21D11/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/362</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for loading areas </text><reference><text>lining shafts <class-ref scheme="cpc">E21D5/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/365" definition-exists="false" ipc-concordant="E21D11/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/365</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for intersecting galleries</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/367" definition-exists="false" ipc-concordant="E21D11/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/367</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for junction with the longwall coal face </text><reference><text>walking supports therefor <class-ref scheme="cpc">E21D23/0091</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D11/38" definition-exists="false" ipc-concordant="E21D11/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Waterproofing </text><reference><text>in general <class-ref scheme="cpc">E02D31/00</class-ref></text></reference></title-part><title-part><text>Heat insulating</text></title-part><title-part><text>Soundproofing</text></title-part><title-part><text>Electric insulating </text><reference><text>for building constructions in general <class-ref scheme="cpc">E04B1/62</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/381" definition-exists="false" ipc-concordant="E21D11/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/381</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Setting apparatus or devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/383" definition-exists="false" ipc-concordant="E21D11/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/383</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by applying waterproof flexible sheets; Means for fixing the sheets to the tunnel or cavity wall</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/385" definition-exists="false" ipc-concordant="E21D11/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/385</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sealing means positioned between adjacent lining members </text><reference><text>for joints in foundation structures <class-ref scheme="cpc">E02D29/16</class-ref>; for sewers <class-ref scheme="cpc">E03F3/04</class-ref>; for building structures in general <class-ref scheme="cpc">E04B1/68</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/386" definition-exists="false" ipc-concordant="E21D11/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D11/386</classification-symbol><class-title><title-part><CPC-specific-text><text>inflatable sealing means</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D11/388" definition-exists="false" ipc-concordant="E21D11/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D11/388</classification-symbol><class-title><title-part><CPC-specific-text><text>having longitudinal cavities communicating with the exterior on the outer side of the lining elements</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D11/40" definition-exists="false" ipc-concordant="E21D11/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Devices or apparatus specially adapted for handling or placing units of linings </text><CPC-specific-text><text>or supporting units</text></CPC-specific-text><text> for tunnels or galleries </text><CPC-specific-text><reference><text>combined with tunnelling shields <class-ref scheme="cpc">E21D9/06</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/403" definition-exists="false" ipc-concordant="E21D11/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D11/403</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>combined with the head machine</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D11/406" definition-exists="false" ipc-concordant="E21D11/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D11/406</classification-symbol><class-title><title-part><CPC-specific-text><text>Placing endless lining elements, e.g. from reels </text><reference><text>in combination with a tunneling shield <class-ref scheme="cpc">E21D9/0609</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D13/00" definition-exists="true" ipc-concordant="E21D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D13/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Large underground chambers</text></title-part><title-part><text>Methods or apparatus for making them </text><reference><text>lining <class-ref scheme="cpc">E21D11/00</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="E21D15/00" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Working-face supports</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D15/00" definition-exists="true" ipc-concordant="E21D15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>E21D15/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Props </text><reference><text>in the building art <class-ref scheme="cpc">E04G25/00</class-ref></text></reference></title-part><title-part><text>Chocks </text><CPC-specific-text><text>, e.g. made of flexible containers filled with backfilling material</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D15/002" definition-exists="false" ipc-concordant="E21D15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Auxiliary devices in which the prop type is not essential </text><reference><text>setting or withdrawing props or chocks <class-ref scheme="cpc">E21D15/58</class-ref>, <class-ref scheme="cpc">E21D15/60</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D15/005" definition-exists="false" ipc-concordant="E21D15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the material</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/007" definition-exists="false" ipc-concordant="E21D15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>spark-reducing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D15/02" definition-exists="false" ipc-concordant="E21D15/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Non-telescopic props</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/04" definition-exists="false" ipc-concordant="E21D15/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with wooden prop parts joined by double conical connectors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/06" definition-exists="false" ipc-concordant="E21D15/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with parts joined by a lock, with or without slight axial adjustability</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/08" definition-exists="false" ipc-concordant="E21D15/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with toggle joint connection</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/10" definition-exists="false" ipc-concordant="E21D15/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with dog-clutch or pin-and-hole connection</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/12" definition-exists="false" ipc-concordant="E21D15/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with locking devices located near head or foot </text><CPC-specific-text><reference><text><class-ref scheme="cpc">E21D15/08</class-ref> and <class-ref scheme="cpc">E21D15/10</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D15/14" definition-exists="false" ipc-concordant="E21D15/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Telescopic props </text><reference><text>general means for fixing telescopic parts together </text><CPC-specific-text><text><class-ref scheme="cpc">F16B7/10</class-ref></text></CPC-specific-text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/15" definition-exists="false" ipc-concordant="E21D15/15" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/15</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Means counteracting entry of dirt</text></title-part><title-part><text>Built-in cleaning devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/155" definition-exists="false" ipc-concordant="E21D15/15" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/155</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Built-in cleaning devices</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/16" definition-exists="false" ipc-concordant="E21D15/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/18" definition-exists="false" ipc-concordant="E21D15/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with one part resting on a supporting medium, e.g. rubber, sand, bitumen, lead, located in the other part, with or without expulsion or displacement of the medium upon excessive pressure </text><CPC-specific-text><reference><text>clamping pressure between telescopic prop elements by means of granular material <class-ref scheme="cpc">E21D15/303</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/20" definition-exists="false" ipc-concordant="E21D15/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches, holes, or the like, spaced apart at intervals</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/22" definition-exists="false" ipc-concordant="E21D15/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/24" definition-exists="false" ipc-concordant="E21D15/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with axial screw-and-nut, rack-and-worm, or like mechanism</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D15/26" definition-exists="false" ipc-concordant="E21D15/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with screw, worm, or the like, not self-locking but normally prevented from rotation by friction members which slip upon excessive pressure</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/28" definition-exists="false" ipc-concordant="E21D15/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with parts held relatively to each other by friction or gripping</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/285" definition-exists="false" ipc-concordant="E21D15/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/285</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of wedges or wedge combinations </text><reference><text>details of wedges <class-ref scheme="cpc">E21D15/43</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/30" definition-exists="false" ipc-concordant="E21D15/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means expanded or contracted by pressure applied through the medium of a fluid or quasi- fluid, e.g. rubber </text><CPC-specific-text><reference><text>setting props <class-ref scheme="cpc">E21D15/588</class-ref>, <class-ref scheme="cpc">E21D15/589</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D15/303" definition-exists="false" ipc-concordant="E21D15/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/303</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of granular material </text><reference><text>supporting by means of granular material <class-ref scheme="cpc">E21D15/18</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D15/306" definition-exists="false" ipc-concordant="E21D15/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/306</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of a liquid</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/32" definition-exists="false" ipc-concordant="E21D15/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by a deformable collar </text><CPC-specific-text><text>or clamping means applied symmetrically inside a locking ring</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D15/325" definition-exists="false" ipc-concordant="E21D15/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/325</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by a clamping ring</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/34" definition-exists="false" ipc-concordant="E21D15/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by axially- moving balls, rollers, or the like</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/36" definition-exists="false" ipc-concordant="E21D15/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by a tiltable collar surrounding one or both parts</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/38" definition-exists="false" ipc-concordant="E21D15/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with longitudinally-divided upper or lower prop parts, e.g. interfitting laminations</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/40" definition-exists="false" ipc-concordant="E21D15/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Collar or other support gripped to one or both parts by toggle-action, cam, or other member pivoted or similarly mounted</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/42" definition-exists="false" ipc-concordant="E21D15/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/42</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with special parts to influence the friction</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/43" definition-exists="false" ipc-concordant="E21D15/43" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/43</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details of wedges </text><reference><text>friction linings or pads <class-ref scheme="cpc">E21D15/42</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D15/435" definition-exists="false" ipc-concordant="E21D15/43" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/435</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>hydraulic</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/44" definition-exists="false" ipc-concordant="E21D15/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/44</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hydraulic, pneumatic, or hydraulic-pneumatic props </text><CPC-specific-text><reference><text><u>see</u> also <class-ref scheme="cpc">E21D15/51</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/445" definition-exists="false" ipc-concordant="E21D15/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/445</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a fluid cushion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/45" definition-exists="false" ipc-concordant="E21D15/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/45</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having closed fluid system, e.g. with built-in pumps or accumulators</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/46" definition-exists="false" ipc-concordant="E21D15/46" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/46</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with load-measuring devices</text></title-part><title-part><text>with alarm devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/465" definition-exists="false" ipc-concordant="E21D15/46" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/465</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with essential hydraulic or pneumatic details</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D15/48" definition-exists="false" ipc-concordant="E21D15/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/48</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Chocks or the like</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/483" definition-exists="false" ipc-concordant="E21D15/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/483</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>made of flexible containers, e.g. inflatable, with or without reinforcement, e.g. filled with water, backfilling material or the like </text><reference><text>laggings making use of fluid cushions <class-ref scheme="cpc">E21D11/157</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/486" definition-exists="false" ipc-concordant="E21D15/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/486</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with essential hydraulic or pneumatic details</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D15/50" definition-exists="false" ipc-concordant="E21D15/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Component parts or details of props </text><reference><text><class-ref scheme="cpc">E21D15/43</class-ref>, <class-ref scheme="cpc">E21D15/58</class-ref>, <class-ref scheme="cpc">E21D15/60</class-ref> take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/502" definition-exists="false" ipc-concordant="E21D15/502" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/502</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Prop bodies characterised by their shape, e.g. of specified cross-section</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/51" definition-exists="false" ipc-concordant="E21D15/51" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/51</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves </text><CPC-specific-text><reference><text>not used, <u>see</u> subgroups and <class-ref scheme="cpc">E21D15/44</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/512" definition-exists="false" ipc-concordant="E21D15/51" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/512</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangement of valves </text><reference><text>external control of roof support installations <class-ref scheme="cpc">E21D23/12</class-ref>, <class-ref scheme="cpc">E21D23/26</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/515" definition-exists="false" ipc-concordant="E21D15/51" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/515</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Particular fluids not covered by any chemical subdivision</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/517" definition-exists="false" ipc-concordant="E21D15/51" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/517</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Extension elements</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/52" definition-exists="false" ipc-concordant="E21D15/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-07-01" status="published"><classification-symbol>E21D15/52</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Extensible units located above or below standard props </text><reference><text>for allowing step-by-step movement of cap <class-ref scheme="cpc">E21D23/06</class-ref>; setting props or chocks <class-ref scheme="cpc">E21D15/58</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/523" definition-exists="false" ipc-concordant="E21D15/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/523</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with hydraulic or pneumatic control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/526" definition-exists="false" ipc-concordant="E21D15/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/526</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for step-by-step extension of the prop</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/54" definition-exists="false" ipc-concordant="E21D15/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/54</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details of the ends of props </text><reference><text>for permitting step-by-step movement <class-ref scheme="cpc">E21D23/06</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/545" definition-exists="false" ipc-concordant="E21D15/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/545</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>hydraulic or pneumatic</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/55" definition-exists="false" ipc-concordant="E21D15/55" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/55</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of prop heads </text><CPC-specific-text><text>or feet</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/56" definition-exists="false" ipc-concordant="E21D15/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/56</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details of locks of telescopic props</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/563" definition-exists="false" ipc-concordant="E21D15/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/563</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by which a series of similarly shaped props can obtain an almost equal load-capacity </text><reference><text>setting props or chocks <class-ref scheme="cpc">E21D15/584</class-ref>, <class-ref scheme="cpc">E21D15/589</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/566" definition-exists="false" ipc-concordant="E21D15/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/566</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a fluid cushion</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D15/58" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/58</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Devices for setting props or chocks</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/581" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/581</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in which the props are pre- loaded </text><reference><text>extensible elements at strut extremities <class-ref scheme="cpc">E21D15/52</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/5813" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D15/5813</classification-symbol><class-title><title-part><CPC-specific-text><text>by means of power accumulators to be pre-charged by rock pressure </text><reference><text>by means of hydraulically operated devices <class-ref scheme="cpc">E21D15/587</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/5817" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D15/5817</classification-symbol><class-title><title-part><CPC-specific-text><text>in which the lock is also activated</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/584" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/584</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in which a series of similarly shaped props obtain an almost equal load capacity by removable devices </text><reference><text>idem for extensible props <class-ref scheme="cpc">E21D15/563</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/585" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/585</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important </text><reference><text>hydraulic props in which the hydraulic part is important <class-ref scheme="cpc">E21D15/44</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/586" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/586</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the props being pre-loaded</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D15/587" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/587</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of power accumulators to be pre-charged by rock pressure</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D15/588" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/588</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the lock also being activated</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D15/589" definition-exists="false" ipc-concordant="E21D15/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/589</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in which a series of similarly shaped props are given almost equal load capacity by removable devices</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D15/60" definition-exists="false" ipc-concordant="E21D15/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/60</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Devices for withdrawing props or chocks</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/603" definition-exists="false" ipc-concordant="E21D15/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/603</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of hydraulic devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D15/606" definition-exists="false" ipc-concordant="E21D15/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D15/606</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the props being moved systematically </text><reference><text>mine roof supports for step-by-step movement <class-ref scheme="cpc">E21D23/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D17/00" definition-exists="true" ipc-concordant="E21D17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Caps for supporting mine roofs</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D17/003" definition-exists="false" ipc-concordant="E21D17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with essential hydraulic elements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D17/006" definition-exists="false" ipc-concordant="E21D17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the material</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D17/01" definition-exists="false" ipc-concordant="E21D17/01" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>characterised by the shape of the cap, e.g. of specified cross-section</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D17/02" definition-exists="false" ipc-concordant="E21D17/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cantilever extension or similar protecting devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D17/0206" definition-exists="false" ipc-concordant="E21D17/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/0206</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hydraulically operated extension devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D17/0213" definition-exists="false" ipc-concordant="E21D17/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/0213</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Assembling devices for pivoting caps upwardly</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D17/03" definition-exists="false" ipc-concordant="E21D17/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Brackets for roof-supporting bars</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D17/04" definition-exists="false" ipc-concordant="E21D17/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for use in longwall working</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D17/06" definition-exists="false" ipc-concordant="E21D17/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for use in drifting galleries</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D17/08" definition-exists="false" ipc-concordant="E21D17/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cap joints for obtaining a coal-face free of pit-props</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D17/082" definition-exists="false" ipc-concordant="E21D17/082" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/082</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of sliding type</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D17/086" definition-exists="false" ipc-concordant="E21D17/086" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>or articulated type</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D17/10" definition-exists="false" ipc-concordant="E21D17/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D17/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details of mine caps for engaging the tops of pit-props, with or without retaining-plates</text></title-part><title-part><text>Retaining-plates</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D19/00" definition-exists="true" ipc-concordant="E21D19/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D19/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Provisional protective covers for working space </text><reference><text><class-ref scheme="cpc">E21D9/06</class-ref>, <class-ref scheme="cpc">E21D23/00</class-ref> take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D19/02" definition-exists="false" ipc-concordant="E21D19/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D19/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for use in longwall working</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D19/04" definition-exists="false" ipc-concordant="E21D19/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D19/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for use in drifting galleries</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D20/00" definition-exists="true" ipc-concordant="E21D20/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D20/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Setting anchoring-bolts </text><reference><text>anchoring bolts for shafts, tunnels or galleries <class-ref scheme="cpc">E21D21/00</class-ref>; means for anchoring structural elements or bulkheads specially adapted to foundation engineering <class-ref scheme="cpc">E02D5/74</class-ref>; dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose <class-ref scheme="cpc">F16B13/00</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D20/003" definition-exists="false" ipc-concordant="E21D20/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D20/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Machines for drilling anchor holes and setting anchor bolts</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D20/006" definition-exists="false" ipc-concordant="E21D20/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D20/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having magazines for storing and feeding anchoring-bolts </text><reference><text>combined feeding from racks and connecting of drill rods or the like <class-ref scheme="cpc">E21B19/20</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D20/02" definition-exists="false" ipc-concordant="E21D20/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D20/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with provisions for grouting</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D20/021" definition-exists="false" ipc-concordant="E21D20/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D20/021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Grouting with inorganic components, e.g. cement</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D20/023" definition-exists="false" ipc-concordant="E21D20/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D20/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cartridges; Grouting charges</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D20/025" definition-exists="false" ipc-concordant="E21D20/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D20/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Grouting with organic components, e.g. resin</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D20/026" definition-exists="false" ipc-concordant="E21D20/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D20/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cartridges; Grouting charges</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D20/028" definition-exists="false" ipc-concordant="E21D20/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D20/028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Devices or accesories for injecting a grouting liquid in a bore-hole </text><reference><text><class-ref scheme="cpc">E21D20/003</class-ref> takes precedence; improving soil or rock by injections <class-ref scheme="cpc">E21D9/001</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D21/00" definition-exists="true" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>E21D21/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Anchoring-bolts for roof, floor </text><CPC-specific-text><text>in galleries or longwall working</text></CPC-specific-text><text>, or shaft-lining protection </text><reference><CPC-specific-text><text>ground anchors <class-ref scheme="cpc">E02D5/80</class-ref>; anchorings for building constructions <class-ref scheme="cpc">E04B1/41</class-ref>, <class-ref scheme="cpc">E21D21/00</class-ref></text></CPC-specific-text><text>; dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose <class-ref scheme="cpc">F16B13/00</class-ref>  </text><CPC-specific-text><text>; bolts with visible load <class-ref scheme="cpc">G01L1/00</class-ref></text></CPC-specific-text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D21/0006" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/0006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the bolt material</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D21/0013" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/0013</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Protection against corrosion</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D21/002" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using explosives charges</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D21/0026" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/0026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by constructional features of the bolts</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D21/0033" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/0033</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a jacket or outer tube</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D21/004" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bolts held in the borehole by friction all along their length, without additional fixing means</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D21/0046" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/0046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>formed by a plurality of elements arranged longitudinally</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D21/0053" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D21/0053</classification-symbol><class-title><title-part><CPC-specific-text><text>Anchoring-bolts in the form of lost drilling rods</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D21/006" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D21/006</classification-symbol><class-title><title-part><CPC-specific-text><text>Anchoring-bolts made of cables or wires</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D21/0066" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D21/0066</classification-symbol><class-title><title-part><CPC-specific-text><text>Anchoring-bolts formed by a bundle of radially arranged rigid elements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D21/0073" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D21/0073</classification-symbol><class-title><title-part><CPC-specific-text><text>Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D21/008" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Anchoring or tensioning means</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D21/0086" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/0086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bearing plates</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D21/0093" definition-exists="false" ipc-concordant="E21D21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/0093</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Accessories</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D21/02" definition-exists="false" ipc-concordant="E21D21/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D21/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having means for indicating tension </text><reference><text>screwed connections specially modified for indicating tensile load <class-ref scheme="cpc">F16B31/02</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="E21D23/00" definition-exists="true" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>E21D23/00</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor </text><reference><CPC-specific-text><text>transport of mine roof support units <class-ref scheme="cpc">E21F13/008</class-ref>; </text></CPC-specific-text><text> shifting of mine conveyors at the working face <class-ref scheme="cpc">E21F13/08</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/0004" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>along the working face</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0008" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a pair of joined struts</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0013" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0013</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Frame type supports</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0017" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0017</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pile type supports</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/0021" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising two walking elements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/0026" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising three walking elements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/003" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>consisting of a rigid pile</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0034" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0034</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a goaf shield articulated to a base member</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/0039" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0039</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and supported by a strut or by a row of struts parallel to the working face</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/0043" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0043</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and supported by two or more rows of struts parallel to the working face</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/0047" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0047</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>without essential shifting devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/0052" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0052</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with advancing shifting devices connected therewith</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/0056" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0056</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with individual advancing shifting devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/006" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>provided with essential hydraulic devices</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0065" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>driven, or automatically, e.g. electrically-hydraulically controlled</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0069" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0069</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>without essential advancing shifting devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0073" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0073</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with advancing shifting devices connected therewith</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0078" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0078</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with individual shifting devices</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/0082" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially adapted for vertical or steep gradient seams</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/0086" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in galleries</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0091" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0091</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>at the junction with the working face</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0095" definition-exists="false" ipc-concordant="E21D23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0095</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Temporary supports at the driving front</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/03" definition-exists="false" ipc-concordant="E21D23/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having protective means, e.g. shields, for preventing or impeding entry of loose material into the working space or support</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/04" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props</text></title-part><title-part><text>Means for counteracting lateral sliding on inclined floor </text><reference><text><class-ref scheme="cpc">E21D23/14</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0409" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0409</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Aligning or guiding means for the supports or for the constitutive parts of the supports</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0418" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0418</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Positioning devices and stabilizing means for the props</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0427" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0427</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Shield operating devices; Hinges therefor</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0436" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0436</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Means for inclining the base member of the support</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0445" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>E21D23/0445</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>Extensions of the base member supporting the conveyor</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0454" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0454</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Trailing plates; Coal face or goaf side sprags </text><reference><text>specially adapted for the placing of filling-up materials <class-ref scheme="cpc">E21D23/0481</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0463" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0463</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hanging or shifting means for tubes, electric feeding cables or the like</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0472" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/0472</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Supports specially adapted for people walking or transporting material</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/0481" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>E21D23/0481</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Supports specially adapted for use in combination with the placing of filling-up materials </text><reference><text>placing filling-up materials in underground workings <u>per se</u> <class-ref scheme="cpc">E21F15/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/049" definition-exists="false" ipc-concordant="E21D23/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/049</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Connecting devices between the head or foot of a prop and the cap or base of the roof support</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/06" definition-exists="false" ipc-concordant="E21D23/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Special mine caps or special tops of pit-props for permitting step-by-step movement</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/063" definition-exists="false" ipc-concordant="E21D23/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Retractable cantilever extensions therefor</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/066" definition-exists="false" ipc-concordant="E21D23/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pivoted cantilever extensions therefor</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/08" definition-exists="false" ipc-concordant="E21D23/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Advancing mechanisms </text><reference><text><class-ref scheme="cpc">E21D23/16</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/081" definition-exists="false" ipc-concordant="E21D23/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>forming parts of the roof supports</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/082" definition-exists="false" ipc-concordant="E21D23/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>acting solely on the elements of the supports</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/083" definition-exists="false" ipc-concordant="E21D23/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/083</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>acting on a firm abutment adapted thereto</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/085" definition-exists="false" ipc-concordant="E21D23/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>E21D23/085</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>acting on a conveyor or a guide for the mining machine</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D23/086" definition-exists="false" ipc-concordant="E21D23/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details of fixing devices therefor</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/087" definition-exists="false" ipc-concordant="E21D23/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/087</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>acting directly on the walls of the seam</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="E21D23/088" definition-exists="false" ipc-concordant="E21D23/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/088</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of wheels, rollers, caterpillars, belts or worm screws</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/10" definition-exists="false" ipc-concordant="E21D23/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with advancing devices separate from the supporting construction</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/12" definition-exists="false" ipc-concordant="E21D23/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Control, e.g. using remote control </text><reference><text><class-ref scheme="cpc">E21D23/16</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/14" definition-exists="false" ipc-concordant="E21D23/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>E21D23/14</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Effecting automatic sequential movement of supports, e.g. one behind the other </text><CPC-specific-text><reference><text>advancing of mining machines toward the working face <class-ref scheme="cpc">E21C29/02</class-ref>; advancing of conveyors toward the working face <class-ref scheme="cpc">E21D23/085</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/142" definition-exists="false" ipc-concordant="E21D23/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D23/142</classification-symbol><class-title><title-part><CPC-specific-text><text>Measuring the advance of support units with respect to external points of reference</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/144" definition-exists="false" ipc-concordant="E21D23/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D23/144</classification-symbol><class-title><title-part><CPC-specific-text><text>Measuring the advance of support units with respect to internal points of reference, e.g. with respect to neighboring support units or extension of a cylinder</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/146" definition-exists="false" ipc-concordant="E21D23/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D23/146</classification-symbol><class-title><title-part><CPC-specific-text><text>Transmission of signals and commands by cable</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/148" definition-exists="false" ipc-concordant="E21D23/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-01-01" status="published"><classification-symbol>E21D23/148</classification-symbol><class-title><title-part><CPC-specific-text><text>Wireless transmission of signals or commands</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="E21D23/16" definition-exists="false" ipc-concordant="E21D23/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/18" definition-exists="false" ipc-concordant="E21D23/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of advancing mechanisms</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/20" definition-exists="false" ipc-concordant="E21D23/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for sequential movement, e.g. one behind the other</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/22" definition-exists="false" ipc-concordant="E21D23/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>incorporated in mine caps</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="E21D23/24" definition-exists="false" ipc-concordant="E21D23/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the advancing mechanisms being separate from the supporting construction</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="E21D23/26" definition-exists="false" ipc-concordant="E21D23/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>E21D23/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hydraulic or pneumatic control</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item></class-scheme>