| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 8 | |
| #2 | United States | 2 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Machine tools | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones | |
| #2 | Special information storage | |
| #3 | Unspecified technologies | |
| #4 | Hand-held cutting tools |
| # | Name | Total Patents |
|---|---|---|
| #1 | Schaaf Alexander | 8 |
| #2 | Alexander Schaaf | 2 |
| #3 | Rudolf Schunemann | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB789069A | Electro-acoustic apparatus | |
| US2347799A | Loud-speaker | |
| US2301147A | Electric safety razor |