Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864117 | Device with a discriminating priority system | Tokuji Ishida, Masataka Hamada | 1989-09-05 |
| 4829170 | Digital focus detecting device | Tokuji Ishida, Masataka Hamada | 1989-05-09 |