| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Finland | 5 | |
| #2 | France | 5 | |
| #3 | Germany | 3 | |
| #4 | United Kingdom | 2 | |
| #5 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Telecommunications | |
| #3 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Special information storage | |
| #2 | Telephonic communication | |
| #3 | Loudspeakers and microphones | |
| #4 | Electric switches |
| # | Name | Total Patents |
|---|---|---|
| #1 | Franz Seelau | 2 |
| #2 | Newman Alexander M | 2 |
| #3 | Ernst Vorbeck | 1 |
| #4 | Seelau F | 1 |
| #5 | Newman A M | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB168300A | A device for automatically making and breaking an electric circuit with the commencement and ceasing of speaking currents and similar electric oscillations | |
| DE336846C | Device on telephonograph for mechanical production of the respective operating state, such as recording, playback o. | |
| DE336112C | Arrangement and adjusting device for the sound boxes of phonographs and similar devices |