Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4809501 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | Toshinari Nagai | 1989-03-07 |
| 4796425 | Double air-fuel ratio sensor system carrying out learning control operation | Toshinari Nagai | 1989-01-10 |