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| Number | Title | Issue Date |
| 5588772 | High strength, quick connect/disconnect coupling A coupling for transferring torque and axial force from a first member to a second member. The coupling includes a first cylindrical member having an outer peripheral surface and an end portion and a second cylindrical member having a receiving end portio... | 12/31/1996 |
| 5409324 | High strength, quick connect/disconnect coupling A coupling for transferring torque and axial force from a first member to a second member. The coupling includes a first cylindrical member having an outer peripheral surface and an end portion and a second cylindrical member having a receiving end portio... | 04/25/1995 |
| 4660634 | Automatic drill pipe breakout Automatic drill pipe breakout torque is provided by a power sub or swivel. By connecting the drive pin of the power sub to the drill pipe in a non-threaded releasable manner the power sub is able to provide the breakout torque to breakout both threaded co... | 04/28/1987 |
