Issued Patents All Time
Showing 26–32 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D308874 | Ball end mill | Osamu Tsujimura, Tatsuo Arai | 1990-06-26 |
| 4934881 | Ball end mill | Osamu Tsujimura, Yuzo Koesashi | 1990-06-19 |
| 4927303 | Ball end mill | Osamu Tsujimura, Masaaki Nakayama | 1990-05-22 |
| 4919573 | Ball end mill | Osamu Tsujimura, Tatsuo Arai | 1990-04-24 |
| 4898499 | Ball end mill | Osamu Tsujimura, Tatsuo Arai, Masaaki Nakayama | 1990-02-06 |
| 4883391 | Ball end mill | Osamu Tsujimura, Tatsuo Arai | 1989-11-28 |
| 4834591 | Indexable cutter insert | Osamu Tsujimura, Masaaki Nakayama | 1989-05-30 |