Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4571002 | Hydraulic rock splitter | Shigetake Akanuma, Satoshi Takashima, Haruo Imamura | 1986-02-18 |
| 4566736 | Apparatus for mechanically breaking up rock | Shigetake Akanuma, Minoru Nakajima, Satoshi Takashima, Haruo Imamura, Hiroshi Kakuta +1 more | 1986-01-28 |
| 4474410 | Power-driven, wedge-operated rock splitter | Koji Ogaki, Shigetake Akanuma, Yoshinori Takada, Shigeru Harada | 1984-10-02 |