Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875444 | Swirl chamber for diesel engines and the like | Hirofumi Tsuchida, Toshiaki Tanaka, Akira Oyamada | 1989-10-24 |
SH
Sumio Hirao
Overall (1989): #54,401 of 140,708Top 40%
1
Patents 1989