Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886142 | Hydraulic four-wheel drive system | Kojiro Yamaoka, Kazuhiko Yano, Ryota Ohashi | 1989-12-12 |
| 4882940 | Power transmission mechanism for tractor | Kojiro Yamaoka, Koichiro Fujisaki, Hideaki Okada | 1989-11-28 |
| 4798259 | Front wheel speed-up mechanism for a four wheel drive vehicle when turning | Toshiyuki Hacegawa | 1989-01-17 |