Structural parts for oil and gas well pumping machines, namely, fluid ends, fluid end expendables, power ends, and plungers; Devices used in servicing oil and gas wells, namely, valves for pumps and downhole packers being mechanical devices comprised of overlapping rigid segments and an elastomeric matrix for sealing oil and gas wells to contain fluids

'compris':38 'contain':54 'devic':20,37 'downhol':33 'elastomer':45 'end':12,14,17 'expend':15 'fluid':11,13,55 'gas':6,26,51 'machin':9 'matrix':46 'mechan':36 'name':10,28 'oil':4,24,49 'overlap':40 'packer':34 'part':2 'plunger':19 'power':16 'pump':8,31 'rigid':41 'seal':48 'segment':42 'servic':23 'structur':1 'use':21 'valv':29 'well':7,27,52

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