Valves as parts of machines; back pressure valves as parts of machines; hydraulic valve actuators; hydraulic component not including vehicle hydraulic system, namely, dual plate wafer checks and rising stem balls; downstream and upstream back pressure valves for oil and gas

'actuat':15 'back':6,35 'ball':31 'check':27 'compon':17 'downstream':32 'dual':24 'gas':41 'hydraul':13,16,21 'includ':19 'machin':5,12 'name':23 'oil':39 'part':3,10 'plate':25 'pressur':7,36 'rise':29 'stem':30 'system':22 'upstream':34 'valv':1,8,14,37 'vehicl':20 'wafer':26

Valves of metal other than parts of machines; downstream and upstream valves of metal for oil and gas other than parts of machines

'downstream':9 'gas':18 'machin':8,23 'metal':3,14 'oil':16 'part':6,21 'upstream':11 'valv':1,12

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