| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 24 | |
| #2 | Switzerland | 1 | |
| #3 | Germany | 1 | |
| #4 | Denmark | 1 | |
| #5 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Basic communication technologies |
| # | Technology | |
|---|---|---|
| #1 | Tuning resonant circuits |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ludwig Neumann Gesellschaft M | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB451836A | Station indicating device for radio receiving apparatus and the like | |
| DE679069C | Station display device for radios u. like |