Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5350261 | Twist drill | Kazuo Takasaki, Kazuaki Tone | 1994-09-27 |
| 4699549 | Insert rotary cutter | Hiroshi Shimomura, Kazuo Iizuka | 1987-10-13 |
| 4565471 | Drill bit | Hideo Negishi, Kaoru Goto | 1986-01-21 |
| 4373839 | Drill bit | Hideo Negishi, Kaoru Goto | 1983-02-15 |