Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859051 | Eye testing apparatus | Yasufumi Fukuma, Yasuo Kato | 1989-08-22 |
| 4848895 | Automatic eye refractive power measuring apparatus | Yasuo Kato, Kiwami Horiguchi, Shinji Wada | 1989-07-18 |