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thus allowing him more freedom during the time it takes for the Kelly-hose unwinds the drilling cable olf of the drilling rig drum shaft and

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A power kelly cock comprises a ball type plug valve for permitting or preventing the transmission of drilling fluid through a kelly and a powered actuator

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Disclosed is a fully hydraulic top-drive truck-mounted drilling rig which mainly resolves the problem that an existing drilling rig is inconvenient in move

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A drill rig assembly adapted to be mounted on or Kelly bar, which acts as a drive shaft. Thishose connections from the drill rods to the

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Disclosed is a fully hydraulic top-drive truck-mounted drilling rig which mainly resolves the problem that an existing drilling rig is inconvenient in move

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