| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Measurement | |
| #3 | Telecommunications |
| # | Technology | |
|---|---|---|
| #1 | Measuring distances | |
| #2 | Electrically-conductive connections | |
| #3 | Cables and insulators | |
| #4 | Transmission systems |
| Publication | Filing date | Title |
|---|---|---|
| DE431128C | Plug contact | |
| DE419310C | Reading device for nautical devices to determine course and bearing angles | |
| DE425109C | Rotating field or alternating field remote pointer | |
| DE426696C | Gyroscope with a display device for measuring the inclination of an aircraft | |
| DE428875C | Electrical resistance material |