Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4836349 | Clutch type tightening apparatus for allowing free adjustment of tightening force | Junshin Sakamoto, Akinori Tsushima | 1989-06-06 |
| 4831364 | Drilling machine | Shigeru Shinohara, Masateru Niyada | 1989-05-16 |
| 4803410 | Variable duty ratio speed controller for DC motors | Shigeru Shinohara | 1989-02-07 |