Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875450 | Ignition timing controlling device for an internal combustion engine | Makoto Kawai | 1989-10-24 |
| 4846128 | Ignition timing control system for internal combustion engine | Shizuo Yagi, Yoshiaki Hirosawa, Makoto Kawai, Yorihisa Yamamoto, Kenichi Nakamura | 1989-07-11 |