Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D309624 | Electronic calculator | Takahisa Yubisui, Hiroshi Sakaguchi | 1990-07-31 |
| D307595 | Electronic calculator | Takahisa Yubisui, Hiroshi Sakaguchi | 1990-05-01 |
| D303680 | Electronic calculator | Takahisa Yubisui, Hiroshi Sakaguchi | 1989-09-26 |