| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 13 | |
| #2 | Switzerland | 1 | |
| #3 | Germany | 1 | |
| #4 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Loudspeakers and microphones |
| # | Name | Total Patents |
|---|---|---|
| #1 | Andrusko Friedrich Ing | 8 |
| #2 | Fiala Walter Dipl Ing | 3 |
| #3 | Heinrich Co Henry-Radio | 1 |
| #4 | Goerike Rudolf | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE743231C | Horn loudspeaker with several exponential loudspeakers arranged in a fan-like manner to achieve a predetermined directional characteristic, in particular tweeter |