Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871238 | Photographic optical device with variable magnification | Yasuhisa Sato, Yasuyuki Yamada, Hiroki Nakayama | 1989-10-03 |
| 4842395 | Finder of variable magnification | Yasuhisa Sato, Nozomu Kitagishi, Yasuyuki Yamada, Hiroki Nakayama | 1989-06-27 |
| 4830474 | Variable magnification optical system | Hiroki Nakayama, Yasuhisa Sato, Yasuyuki Yamada | 1989-05-16 |