Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6776070 | Iron roughneck | George I. Boyadjieff, Johannes Kamp, Ronaldus Roling | 2004-08-17 |
| 6758280 | Non-seize material attachment for a drill slip system | J. W. H. Van Rijzingen, Rosmalen R. Roling | 2004-07-06 |