Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858580 | Knocking control system for internal combustion engine | Shigeru Yamamoto | 1989-08-22 |
| 4856481 | Engine knocking control unit | Shigeru Yamamoto, Tetsushi Hosokai, Koji Miyamoto | 1989-08-15 |