Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4711312 | Drill bit | Owen K. Crist | 1987-12-08 |
| 4605079 | Drill bit | Owen K. Crist | 1986-08-12 |
| 4371210 | Freely rotatable pick bit holder on rotary driven member and method | — | 1983-02-01 |