Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823203 | Rotation speed detection circuit in a video disc playback device for detecting a state in which the rotation speed is double a normal speed | — | 1989-04-18 |
| 4815063 | Disc motor control circuit for controlling the rotation of a disc in a disc playing device | Shinzi Aoshima | 1989-03-21 |