Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862977 | Drill bit and cutter therefor | John D. Barr, Malcolm R. Taylor | 1989-09-05 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862977 | Drill bit and cutter therefor | John D. Barr, Malcolm R. Taylor | 1989-09-05 |