Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4537224 | Rubber tube for dredging work | Katsuyoshi Sumitani | 1985-08-27 |
| 4243132 | Speed controller for the rolling cylindrical articles | Isamu Miyakoshi, Kenji Ito, Hideo Azuma, Fukuzo Kitakaze, Takamichi Tomotaki | 1981-01-06 |