Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4832136 | Drill bit and roller cutter for said drill bit | Michael Mattsson | 1989-05-23 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4832136 | Drill bit and roller cutter for said drill bit | Michael Mattsson | 1989-05-23 |