| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 15 | |
| #2 | United States | 6 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Computer technology | |
| #3 | Optics | |
| #4 | Consumer goods | |
| #5 | Electrical machinery and energy |
| # | Name | Total Patents |
|---|---|---|
| #1 | Franz Jokel | 2 |
| #2 | Adolf Salomon | 1 |
| #3 | Hanns Hubner | 1 |
| #4 | Max Goldstein Carl | 1 |
| #5 | Karl Holtz | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1621670A | Sound-box diaphragm for use in telephones, loud speakers, acoustic apparatus, and the like | |
| US1705663A | Sound duct for talking machines | |
| US1620257A | Talking machine | |
| GB167483A | Improvements in and relating to focussing means for optical instruments |