Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5375672 | Mine roof drill bit and cutting insert therefor | Jan Akerman | 1994-12-27 |
| 5301763 | Apparatus for drilling holes in mine roofs and a roof drill bit for use therein | Lawrence E. Gray | 1994-04-12 |