7
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
37
earth drilling services, namely drilling of wells in the earth, including work-over and extension of existing wells, particularly by directional drilling, leasing of earth drilling equipment, including positive displacement motors, rotary earth drilling bits, nonmagnetic drill collars, underreamers, hole openers, gamma MWD apparatus and drilling steering tools for directional drilling
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