H05FSTATIC ELECTRICITYNATURALLY-OCCURRING ELECTRICITY electrostatic machines H02N; uses of electricity in performing operations, e.g. precipitation, see the relevant subclasses for the operationsThis subclass covers methods or arrangements for preventing the formation of electrostatic charges on bodies or for carrying-off these charges after their formation.This subclass does not cover specific applications of the above-mentioned methods or arrangements, e.g. during the manufacture of artificial fibres or films, which are covered by the relevant subclasses.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. H05F1/00 H05F1/00Preventing the formation of electrostatic charges H05F1/02by surface treatment H05F3/00Carrying-off electrostatic charges from shoes A43B7/36; from living beings A61N1/14; from tyres B60C19/08; from vehicles B60R16/06; from aircraft B64D45/02; from large containers B65D90/46 H05F3/02by means of earthing connections H05F3/025Floors or floor coverings specially adapted for discharging static charges H05F3/04by means of spark gaps or other discharge devices devices providing for corona discharge per se H01T19/00 H05F3/06by means of ionising radiation H05F7/00Use of naturally-occurring electricity, e.g. lightning or static electricity