Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4362135 | Piston ring of internal combustion engine | — | 1982-12-07 |
SI
Shoichiro Irimajiri
Overall (1982): #31,410 of 81,411Top 40%
1
Patents 1982