Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875500 | Diaphragm type of pilot operated directional control valve | Ryozo Ariizumi, Masakuni Kainuma, Shoji Suda, Toshikazu Aoki, Takashi Ejiri +1 more | 1989-10-24 |
| 4823834 | Diaphragm type of pilot operated directional control valve | Ryozo Ariizumi, Masakuni Kainuma, Shoji Suda, Toshikazu Aoki, Takashi Ejiri +1 more | 1989-04-25 |