Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875532 | Roller drill bit having radial-thrust pilot bushing incorporating anti-galling material | — | 1989-10-24 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875532 | Roller drill bit having radial-thrust pilot bushing incorporating anti-galling material | — | 1989-10-24 |