Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882030 | Air-fuel ratio detection system for engine exhaust gas | Seikoo Suzuki, Masayuki Miki, Takao Sasayama, Yoshishige Oyama | 1989-11-21 |
| 4825838 | Air/fuel ratio control apparatus for an internal combustion engine | Yoshishige Oyama | 1989-05-02 |