Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881368 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | Kohei Igarashi | 1989-11-21 |
| 4811557 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | Atsuo Okumura | 1989-03-14 |