| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 31 | |
| #2 | United Kingdom | 2 | |
| #3 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Basic communication technologies | |
| #2 | Electrical machinery and energy | |
| #3 | Measurement | |
| #4 | Medical technology | |
| #5 | Audio-visual technology |
| # | Name | Total Patents |
|---|---|---|
| #1 | Boucke Heinz | 24 |
| #2 | Unverricht Dr Med Walter | 3 |
| #3 | Heinz Boucke | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US2327244A | Automatic control of tuning and band width | |
| US2320558A | Audio band width control | |
| DE697085C | Device for measuring the volume of body parts | |
| DE707915C | Arrangement for measuring the change in volume of organic tissue | |
| GB485005A | Improvements in and relating to sound reproducing systems | |
| DE687916C | especially in human body parts | |
| GB468774A | Arrangement of inductance coils |