Wellheads used in land-based, oil and gas well drilling operations and component parts of wellheads used in land-based, oil and gas well drilling, namely, casing heads, casing spools, tubing heads, casing hangers, tubing hangers, tubing head adaptors, test plugs, wear bushings, running tools, secondary seals, chokes, and valves

'adaptor':41 'base':6,22 'bush':45 'case':29,31,35 'choke':50 'compon':14 'drill':11,27 'gas':9,25 'hanger':36,38 'head':30,34,40 'land':5,21 'land-bas':4,20 'name':28 'oil':7,23 'oper':12 'part':15 'plug':43 'run':46 'seal':49 'secondari':48 'spool':32 'test':42 'tool':47 'tube':33,37,39 'use':2,18 'valv':52 'wear':44 'well':10,26 'wellhead':1,17

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