Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5257667 | Vibrating pile driver | Yuji Sano | 1993-11-02 |
| 5177386 | Vibration generator adjustable during operation | — | 1993-01-05 |
| 5168938 | Pile driver | Yuji Sano, Yasuo Tasaki, Seizo Kumai | 1992-12-08 |