Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862777 | Method and apparatus for forming surfaces on piston rings | Shigeo Sakurai | 1989-09-05 |
MO
Masayuki Onimaru
Overall (1989): #79,444 of 140,708Top 60%
1
Patents 1989