| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 12 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Optics | |
| #3 | Electrical machinery and energy | |
| #4 | Basic communication technologies | |
| #5 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Special information storage | |
| #2 | Cameras | |
| #3 | Photosensitive materials | |
| #4 | Measuring speed and acceleration | |
| #5 | Television | |
| #6 | Dynamo-electric machines | |
| #7 | Amplification control | |
| #8 | Optical systems |
| Publication | Filing date | Title |
|---|---|---|
| DE599844C | Device for electrical regulation of the intensity of a bundle of light rays |