Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5230593 | Twist drill | Koujiro Imanaga, Shinichi Nakamura, Yoshiyuki Yanase | 1993-07-27 |
| 5088863 | Twist drill | Koujiro Imanaga, Shinichi Nakamura, Yoshiyuki Yanase | 1992-02-18 |
| 4983079 | Twist drill | Koujiro Imanaga, Shinichi Nakamura, Yoshiyuki Yanase | 1991-01-08 |