Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876158 | Piston ring having a wear resistant surface layer | Toru Onuki, Junichi Sagawa, Tamotsu Watanabe | 1989-10-24 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876158 | Piston ring having a wear resistant surface layer | Toru Onuki, Junichi Sagawa, Tamotsu Watanabe | 1989-10-24 |