| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 7 | |
| #2 | United Kingdom | 3 | |
| #3 | United States | 2 | |
| #4 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Optics | |
| #3 | Organic fine chemistry |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Cameras | |
| #3 | Advertising | |
| #4 | Special information storage | |
| #5 | Acyclic or carbocyclic compounds |
| # | Name | Total Patents |
|---|---|---|
| #1 | Fritz Spiegel | 1 |
| #2 | Walter Vollmann | 1 |
| #3 | Gunther Wurdel | 1 |
| #4 | Vollmann Walter | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB480077A | Improvements in automatic stopping devices for talking machines | |
| GB384055A | Improvements in or relating to the magnetic systems of sound reproducing apparatus | |
| US1799942A | Sound transforming and reproducing apparatus | |
| GB314691A | Diaphragm for loud speakers or the like | |
| US1417474A | Film-winding device |