Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4961341 | Testing device for an oxygen sensor | Masashi Tanaka, Shigekazu Yamauchi | 1990-10-09 |
| 4834051 | Oxygen sensor and an air-fuel ratio control apparatus of an internal combustion engine using the same | Masahi Tanaka, Shigekazu Yamauchi | 1989-05-30 |