| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 8 | |
| #2 | Switzerland | 1 | |
| #3 | United Kingdom | 1 | |
| #4 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ehrlich Bernhard | 11 |
| #2 | Konrad Max | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US814680A | Telephone attachment. | |
| GB190507159A | Improvements in Telephone Apparatus. |