Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5797465 | Multi-shaft drilling unit | Hiroaki Kubo, Akira Mori, Hachiro Hatakeda, Tsutao Takahashi, Tetsuo Nakamura | 1998-08-25 |
| 5575345 | Multi shaft drilling unit | Hiroshi Kotacki | 1996-11-19 |