Oil and gas well equipment, namely, hydraulic valves, circulating valves, ball seats valves, oil well circulating valves, thermal injection valves, steam injection valves, and conventional formation injection valves all being parts of machines and used to control the flow of oil, gas and fracturing fluids in and out of an oil well

'ball':11 'circul':9,16 'control':37 'convent':25 'equip':5 'flow':39 'fluid':45 'format':26 'fractur':44 'gas':3,42 'hydraul':7 'inject':19,22,27 'machin':33 'name':6 'oil':1,14,41,51 'part':31 'seat':12 'steam':21 'thermal':18 'use':35 'valv':8,10,13,17,20,23,28 'well':4,15,52

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