| 摘要 |
A tubular gripping system and a top drive drilling system with such a tubular gripping system, in at least some aspects, the gripping system beneath the top drive unit and, in at least some aspects, the gripping system having a body with four spaced-apart grippers movably connected thereto and piston/cylinder devices movably interconnected with each gripper for moving the grippers to clamp the tubular.
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