Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5704438 | Rotary borer | Richard George Holtshausen, Noel G. Wright | 1998-01-06 |
| 5685381 | Drill rod and drill bit with rocking connection | Jean Frederick Kloppers | 1997-11-11 |
| 5494382 | Drill bit | — | 1996-02-27 |