Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4841510 | Optical characteristic measuring apparatus for an optical recording medium substrate | — | 1989-06-20 |
| 4837758 | Magneto-optical recording reproducing device having field applying means | Kazuyasu Motoyama, Tsuneo Yanagida, Mitsugu Sakai, Hitoshi Ichikawa | 1989-06-06 |