Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877677 | Wear-protected device | Kumiko Hirochi, Makoto Kitabatake | 1989-10-31 |
| 4870632 | Optical head with astigmatic reflecting element | Teruhiro Shiono, Kentaro Setsune | 1989-09-26 |