Valves as machine parts and component parts therefor for use in the operation of oil and gas pipelines

'compon':6 'gas':17 'machin':3 'oil':15 'oper':13 'part':4,7 'pipelin':18 'therefor':8 'use':10 'valv':1

Valves of metal, except as machine parts for use in the operation of oil and gas pipelines; pipe fittings of metal for use in the operation of oil and gas pipelines; pipe connectors of metal for use in the operation of oil and gas pipelines; flange connectors of metal for use in the operation of oil and gas pipelines

'connector':33,47 'except':4 'fit':19 'flang':46 'gas':16,30,44,58 'machin':6 'metal':3,21,35,49 'oil':14,28,42,56 'oper':12,26,40,54 'part':7 'pipe':18,32 'pipelin':17,31,45,59 'use':9,23,37,51 'valv':1

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