Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828381 | Automatic visibility correction viewfinder system for optical devices | — | 1989-05-09 |
| 4829332 | Focus detecting optical system | — | 1989-05-09 |
| 4808806 | Optical system for use in focus detecting apparatus | Ryota Ogawa | 1989-02-28 |