| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 5 | |
| #2 | Austria | 4 | |
| #3 | Switzerland | 1 | |
| #4 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Telecommunications | |
| #3 | Consumer goods | |
| #4 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Transmission | |
| #3 | Sound-producing devices | |
| #4 | Radio navigation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Beschraenkter Haftung Signal G | 1 |
| #2 | Hahnemann Walter | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB220281A | Sound producer comprising a vibratory system coupled with a resonator | |
| GB216105A | Multiple wave acoustic apparatus | |
| GB203700A | Improvements in microphones and similar apparatus | |
| US1711529A | Multiple-range sound-transmitting system | |
| GB204565A | Improvements in directional submarine sound receivers | |
| GB191500398A | Improvements in or relating to Wireless Telegraphy. |