Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5139099 | Excavation tool | Takeshi Hayashi, Shigeru Sato, Katsuaki Tsujimoto, Yoneo Hiwasa, Toshiki Ishimatsu +1 more | 1992-08-18 |
| 5113954 | Excavation tool | Takeshi Hayashi, Shigeru Sato, Katsuaki Tsujimoto, Yoneo Hiwasa, Toshiki Ishimatsu | 1992-05-19 |