Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4390765 | Rubber-made covering member for push button switches | Ryoichi Sado, Yoshitusgu Morikawa, Kazutoki Tahara | 1983-06-28 |
| 4302648 | Key-board switch unit | Ryoichi Sado, Shigeru Matumoto | 1981-11-24 |