Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883391 | Ball end mill | Osamu Tsujimura, Tatsuo Arai | 1989-11-28 |
| 4834591 | Indexable cutter insert | Osamu Tsujimura, Masaaki Nakayama | 1989-05-30 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883391 | Ball end mill | Osamu Tsujimura, Tatsuo Arai | 1989-11-28 |
| 4834591 | Indexable cutter insert | Osamu Tsujimura, Masaaki Nakayama | 1989-05-30 |