| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Germany | 3 | |
| #3 | Japan | 3 | |
| #4 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Computer technology |
| # | Technology | |
|---|---|---|
| #1 | Special information storage | |
| #2 | Stereophonic systems | |
| #3 | Loudspeakers and microphones | |
| #4 | Electric digital data processing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Nagamura Fumitaka | 11 |
| Publication | Filing date | Title |
|---|---|---|
| JPS5597013A | Method and device for audio information recording and reproduction | |
| JPS5582600A | Multi-channel stereo recording and reproduction system and its unit | |
| JPS5544202A | Multi-channel recording and reproducing system and its unit | |
| US4085446A | Data storage and retrieval system | |
| US3988025A | Record disc cutting apparatus | |
| US3940149A | Tonearm linear-drive apparatus | |
| CA1023668A | Grooved record playback system |