Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4316515 | Shaft drill bit with improved cutter bearing and seal arrangement and cutter insert arrangement | — | 1982-02-23 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4316515 | Shaft drill bit with improved cutter bearing and seal arrangement and cutter insert arrangement | — | 1982-02-23 |