Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883136 | Large compact cutter rotary drill bit utilizing directed hydraulics for each cutter | — | 1989-11-28 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883136 | Large compact cutter rotary drill bit utilizing directed hydraulics for each cutter | — | 1989-11-28 |