Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871243 | Photographic lens of improved near distance performance | Takashi Matsushita | 1989-10-03 |
| 4852984 | Telephoto lens of large aperture ratio | Sadatoshi Takahashi, Hiroshi Endo | 1989-08-01 |