manually operated metal valves for use in oil and gas wells and pipeline systems to regulate the flow of fluid, namely, check valves [ and pipeline valves ]

'check':22 'flow':18 'fluid':20 'gas':10 'manual':1 'metal':3 'name':21 'oil':8 'oper':2 'pipelin':13,25 'regul':16 'system':14 'use':6 'valv':4,23,26 'well':11

automatic valves for use in oil and gas wells and pipeline systems, namely, check valves [ and pipeline valve ] for safety use

'automat':1 'check':14 'gas':8 'name':13 'oil':6 'pipelin':11,17 'safeti':20 'system':12 'use':4,21 'valv':2,15,18 'well':9

valves in the nature of machinery to regulate the flow of fluid, namely, [ back pressure valves, ] check valves [ and pipeline valves ] ; all the aforesaid being machines or parts of machines

'aforesaid':24 'back':14 'check':17 'flow':10 'fluid':12 'machin':26,30 'machineri':6 'name':13 'natur':4 'part':28 'pipelin':20 'pressur':15 'regul':8 'valv':1,16,18,21

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