Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4419601 | Spark plug for internal combustion engine | Kyugo Hamai, Yasuhiko Nakagawa, Meroji Nakai | 1983-12-06 |
| 4354136 | Ignition plug for internal combustion engine | Kyugo Hamai, Meroji Nakai, Yasuhiko Nakagawa | 1982-10-12 |