Issued Patents 2003
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6517411 | Automated drill bit re-sharpening and verification system | Paul D Mortell, David M. McElrone, Gary Erpenbeck, Walter James Frandsen, Jr., Charles S. Slemon | 2003-02-11 |