| IPC Code | Description |
| G01N | Measuring, Testing – Investigating or analyzing materials by determining their chemical or physical properties |
| G06F | Computing, calculating, counting - Electric Digital Data Processing |
| G07B | Checking device - Ticket-issuing; Fare-Registering Apparatus; Franking apparatus |
| G06G | Computing, calculating, counting – Analogue computers |
| G06K | Recognition of data; Presentation of data; Record carriers; Handling record carriers |
| G08B | Signaling - Signaling Or Calling Systems; Order Telegraphs; Alarm Systems |
| H04Q | Electric Communication Technique – Selecting (Switches, relays etc.) |