| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 19 | |
| #2 | Germany | 5 | |
| #3 | Finland | 5 | |
| #4 | France | 4 | |
| #5 | Austria | 1 | |
| #6 | Canada | 1 | |
| #7 | Switzerland | 1 | |
| #8 | United Kingdom | 1 | |
| #9 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Basic communication technologies | |
| #2 | Audio-visual technology | |
| #3 | Optics | |
| #4 | Measurement | |
| #5 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Amplification control | |
| #2 | Cameras | |
| #3 | Loudspeakers and microphones | |
| #4 | Measuring electric variables | |
| #5 | Handling thin material | |
| #6 | Special information storage |
| # | Name | Total Patents |
|---|---|---|
| #1 | Beer Palle-Finn | 7 |
| #2 | Schlegel Karl Herman Franz Dr | 4 |
| #3 | Franz Schlegel Karl Hermann | 4 |
| #4 | Arentzen Holger Christian | 3 |
| #5 | Schlegel Karl Hermann Franz Dr | 3 |
| #6 | Hermann Schlegel Karl | 1 |
| #7 | Schlegel Karl Herman Franz | 1 |
| #8 | Schlegel K H F Dr Phil | 1 |
| #9 | Co As Electrical Fono-Films | 1 |
| #10 | Schlegel Herman Franz Dr Phil | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB646180A | Improvements in electrodynamic recording devices | |
| DE896058C | Dynamic control circuit with adjustable degree of control | |
| DE758022C | Cinema projector with constantly moving film tape | |
| DE743668C | Circuit to avoid over-limiting with backward regulated amplitude limiters | |
| DE764082C | Film drive for sound film devices | |
| US2221681A | Volume control system | |
| CA449492A | Sound recording apparatus |