| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 16 | |
| #2 | Spain | 8 | |
| #3 | Canada | 2 | |
| #4 | United Kingdom | 1 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Optics | |
| #3 | Basic communication technologies | |
| #4 | Measurement | |
| #5 | Control |
| # | Technology | |
|---|---|---|
| #1 | Special information storage | |
| #2 | Cameras | |
| #3 | Amplification control | |
| #4 | Special measuring | |
| #5 | Coin-freed |
| # | Name | Total Patents |
|---|---|---|
| #1 | Freund Berthold | 3 |
| #2 | Ehrenhaft Franz | 2 |
| #3 | Berglund Sven A Son | 1 |
| #4 | Franz Ehrenhaft | 1 |
| #5 | Ehrenhaft Fr | 1 |
| #6 | Massolle Joseph | 1 |
| #7 | Freund B | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1983276A | Driving apparatus for sound films | |
| GB344904A | Improvements relating to the photographic recording of sound waves | |
| CA325767A | Sound record making apparatus | |
| CA323514A | Tone and picture film |