U.S. federal trademark · Serial No. 76682293 · Reg. No. 3668049
DRILLING APPARATUS, NAMELY, EARTH BORING DEVICES FOR DRILLING BORE HOLES; DRILL BITS USED TO DRILL THROUGH SUBTERRANEAN ZONES INCLUDING HYDROCARBON RESERVOIRS; DRILLING SYSTEMS COMPRISING TUBULAR MEMBERS AND A DRILL BIT; DRILLING SYSTEMS FOR DRILLING SUBTERRANEAN ZONES COMPRISING AN INNER BIT AND AN OUTER BIT
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