Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4478015 | Cable sling arrangement for pivoting a drilling mast and drawworks elevator to a raised or reclined position in relation to a substructure support and method of cable sling string up | Larry K. Lawrence | 1984-10-23 |