Steel and metal pipes and tubing, including their parts and fittings thereof; joints; metal collars; metal junctions; seamless line pipe; welded line pipe; mother pipes; petrochemical pipes; boiler pipes; exchangers pipes; drilling pipes; steel and metal pipes and vessels used for transporting oil and fuel; tubes used in autoparts and safety devices; metal pipes.

'autopart':49 'boiler':28 'collar':15 'devic':52 'drill':32 'exchang':30 'fit':11 'fuel':45 'includ':7 'joint':13 'junction':17 'line':19,22 'metal':3,14,16,36,53 'mother':24 'oil':43 'part':9 'petrochem':26 'pipe':4,20,23,25,27,29,31,33,37,54 'safeti':51 'seamless':18 'steel':1,34 'thereof':12 'transport':42 'tube':6,46 'use':40,47 'vessel':39 'weld':21

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