APPARATUS AND DEVICES FOR THE PRODUCTION OF NATURAL GAS AND CRUDE OIL, NAMELY, MECHANIZED DRILLING AND PRODUCTION RIGS, PRODUCTION CASINGS AND PRODUCTION TREES; POWER-OPERATED MACHINE AND MACHINE TOOL PARTS FOR EARTH DRILLING AND DEEP DRILLING, NAMELY, DRILL BITS, DRILLS, UNDER REAMERS, DEFLECTORS, DOWN HOLE ROTARY DRILLING MOTORS, PACKERS, ARTICULATED DRILL STRINGS, NON-MAGNETIC DRILL COLLARS AND PARTS THEREFOR

earth drilling equipment for drilling of wells in the earth, including work-over and extension of existing wells, particularly by directional drilling, including positive displacement motors, rotary earth drilling bits, nonmagnetic drill collars, underreamers, hole openers, gamma MWD apparatus and drilling steering tools for directional drilling