Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884501 | Pressure developing apparatus | Hiroshi Kawahara | 1989-12-05 |
| 4797107 | Copyable blackboard | Naoyuki Hatta, Hideo Yoshihara, Akihiro Sawada, Takemi Yamamoto, Kazuo Sangyoji | 1989-01-10 |