| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 5 | |
| #2 | Switzerland | 3 | |
| #3 | France | 3 | |
| #4 | United Kingdom | 2 | |
| #5 | Canada | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Telecommunications | |
| #3 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Special information storage | |
| #2 | Telephonic communication | |
| #3 | Sound-producing devices | |
| #4 | Loudspeakers and microphones |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ronag A-G | 2 |
| #2 | Leopold Neumann | 1 |
| #3 | Neumann Leopold | 1 |
| #4 | G Ronag A | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB476917A | Improvements in or relating to impulse transmitters for telephone systems | |
| GB477868A | Improvements in sound recording apparatus | |
| US2100975A | Sound recording | |
| CA383862A | Sound recording apparatus |