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, Takekuni Okamoto, Kazutoki Tahara | 1983-06-28 |
| 4289940 | Keyboard switch covering pads | Ryoichi Sado | 1981-09-15 |