Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5297833 | Apparatus for gripping a down hole tubular for support and rotation | Clyde D. Durrett | 1994-03-29 |
| 5294228 | Automatic sequencing system for earth drilling machine | Jerry K. Lingafelter | 1994-03-15 |