Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4812642 | Optical coordinate system input device | Kazuo Hasegawa, Hiroaki Sasaki | 1989-03-14 |
| 4806749 | Optical coordinate system input device | Kazuo Hasegawa, Hiroaki Sasaki | 1989-02-21 |