| IPC Facet Classification | |
| A | SECTION A HUMAN NECESSITIES |
| B | SECTION B PERFORMING OPERATIONS TRANSPORTING |
| C | SECTION C CHEMISTRY METALLURGY |
| D | SECTION D TEXTILES PAPER |
| E | SECTION E FIXED CONSTRUCTIONS |
| F | SECTION F MECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING |
| G | SECTION G PHYSICS |
| H | SECTION H ELECTRICITY |