Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883391 | Ball end mill | Tatsuo Arai, Masayuki Okawa | 1989-11-28 |
| 4844666 | Insert rotary cutting tool | Tatsuo Arai, Nobuo Hiyama | 1989-07-04 |
| 4844669 | Insert boring tool and cutting insert therefor | Tatsuo Arai, Takayoshi Saito | 1989-07-04 |
| 4834591 | Indexable cutter insert | Masaaki Nakayama, Masayuki Okawa | 1989-05-30 |
| 4808044 | Insert cutter | Tatsuo Arai | 1989-02-28 |
| 4808045 | End mill with throw-away tip | Takayoshi Saito, Tatsuo Arai, Yasuzo Funaki | 1989-02-28 |