Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870439 | Focal length varying device for camera | Takayuki Tsuboi, Hiroshi Maeno, Yasuhiko Shiomi | 1989-09-26 |
| 4862202 | Magnification change-over device for camera | Takayuki Tsuboi, Yoshihiro Harunari, Yasuhisa Sato, Yasuyuki Yamada | 1989-08-29 |
| 4840466 | Changeable magnification optical system | Yasuyuki Yamada | 1989-06-20 |