init commit

PATSTAT/patstat_analysis_demo.ipynb

@@ -758,6 +758,15 @@
    "metadata": {
     "collapsed": false
    }
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "# Patent classes?"
+   ],
+   "metadata": {
+    "collapsed": false
+   }
   }
  ],
  "metadata": {