Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864436 | Rotary head digital audio recording/reproducing apparatus | Tomoyasu Yamada, Seiichi Yokosawa | 1989-09-05 |
| 4837639 | Control signal extraction in a reproducing apparatus | — | 1989-06-06 |