Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4850695 | Test system for optical disks | Akira Ohya, Minoru Nakagawara, Hideo Hirukawa, Shoji Uehara | 1989-07-25 |
| 4832487 | Test system for optical disks | Masuo Hanawaka, Akira Ohya, Hideo Hirukawa, Shoji Uehara, Kenichi Yamakawa | 1989-05-23 |