| http://www.w3.org/ns/prov#value | - A clamp for use with a top drive for gripping and turning a drill string formed of pipe, the clamp comprising: slips positioned to grip and support the pipe, drive means including a hydraulic system for moving the slips radially inwardly into a pipe gripping position and radially outwardly to a pipe releasing position, and an attachment means for connecting the clamp to a top drive.
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