| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 8 | |
| #2 | United Kingdom | 5 | |
| #3 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Electrical machinery and energy | |
| #3 | Measurement | |
| #4 | Mechanical elements | |
| #5 | Optics | |
| #6 | Chemical engineering | |
| #7 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Special information storage | |
| #2 | Dynamo-electric machines | |
| #3 | Unspecified technologies | |
| #4 | Special measuring | |
| #5 | Separation | |
| #6 | Cameras | |
| #7 | Constructional instrument details | |
| #8 | Gearing | |
| #9 | Shafts |
| # | Name | Total Patents |
|---|---|---|
| #1 | Knecht Emil | 8 |
| #2 | Emil Knecht | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US2952160A | Record changer | |
| GB775956A | Improvements in or relating to disc record players | |
| US2926921A | Tone arm mechanism | |
| GB746251A | Improvements in or relating to record players | |
| GB759313A | Gramophone record player with pick-up arm movement to the record derived from the turntable drive | |
| US2902285A | Record changer | |
| GB735997A | Record changer | |
| GB659044A | Housings for small electric motors, especially gramophone motors |