Downhole production and exploration machinery for use in oil, gas, or geothermal wells, namely, power drill bits, motors not for land vehicles, power operated drilling jars, power tool reamers, power operated perforators for use in perforating wells in preparation for production, top head drives for motors, and hydraulic hammers

'bit':17 'downhol':1 'drill':16,25 'drive':44 'explor':4 'gas':10 'geotherm':12 'hammer':49 'head':43 'hydraul':48 'jar':26 'land':21 'machineri':5 'motor':18,46 'name':14 'oil':9 'oper':24,31 'perfor':32,36 'power':15,23,27,30 'prepar':39 'product':2,41 'reamer':29 'tool':28 'top':42 'use':7,34 'vehicl':22 'well':13,37

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