Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881450 | Drive control system for hydraulic machine | Masakazu Haga, Ichiro Hirami, Kuniaki Yoshida | 1989-11-21 |
| 4875337 | Construction machine dual-dump hydraulic circuit with piloted arm-boom cylinder supply priority switching valves | Genroku Sugiyama, Shinichi Satoh | 1989-10-24 |
| 4858649 | Valve apparatus | Shinichi Satoh, Genroku Sugiyama, Hideaki Tanaka | 1989-08-22 |
| 4832082 | Hydraulic pilot operated directional control valve | Hideaki Tanaka, Genroku Sugiyama, Shinichi Satoh | 1989-05-23 |