Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5256843 | Keyboard switch and method of manufacturing the same | Toshimi Chiba, Sadao Tachibana | 1993-10-26 |
| 4851618 | Keyboard | Fumihiro Amino, Sadao Tachibana, Kazuo Aoki | 1989-07-25 |