High-pressure pumps for use in oil or gas well hydraulic fracturing operations; parts of oilfield wellhead machines, namely, gate valves, ball valves, check valves, plug valves, globe valves, choke and manifold industrial pumps, pump and valve parts, pipe fittings and flanges; shafts for pumps; suction pumps; pump impellers

'ball':23 'check':25 'choke':31 'fit':41 'flang':43 'fractur':13 'gas':10 'gate':21 'globe':29 'high':2 'high-pressur':1 'hydraul':12 'impel':50 'industri':34 'machin':19 'manifold':33 'name':20 'oil':8 'oilfield':17 'oper':14 'part':15,39 'pipe':40 'plug':27 'pressur':3 'pump':4,35,36,46,48,49 'shaft':44 'suction':47 'use':6 'valv':22,24,26,28,30,38 'well':11 'wellhead':18

Repair and maintenance of pumps and parts thereof

'mainten':3 'part':7 'pump':5 'repair':1 'thereof':8

LIQUIDMETAL

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