| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 40 | |
| #2 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Consumer goods | |
| #3 | Optics | |
| #4 | Textiles and paper | |
| #5 | Machine tools | |
| #6 | Thermal processes | |
| #7 | Furniture and games |
| # | Technology | |
|---|---|---|
| #1 | Special information storage | |
| #2 | Sound-producing devices | |
| #3 | Loudspeakers and microphones | |
| #4 | Cameras | |
| #5 | Treatment of fibrous material to obtain filaments | |
| #6 | Toys | |
| #7 | Ignition and extinguishing | |
| #8 | Television | |
| #9 | Sawing | |
| #10 | Wood saws |
| Publication | Filing date | Title |
|---|---|---|
| GB266252A | Improvements in and relating to head telephones | |
| GB238372A | Improvements in gramophones |