Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D412447 | Sample tube for a percussive hammer | Malcolm B. McInnes | 1999-08-03 |
| 5085285 | Compensating ring for a down hole hammer | John Elsby, Andrew Greathead, Brian T. Sanfead | 1992-02-04 |