Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5263899 | Cylindrical telescopic kelly-bar apparatus | Satoshi Nozaki, Hiroshi Kusumi, Akio Kiue, Kenichi Miyata | 1993-11-23 |
| 4595065 | Shaft drilling rig | Masami Wada | 1986-06-17 |
| 4448269 | Cutter head for pit-boring machine | Yasuaki Ishikawa, Masami Wada | 1984-05-15 |