manually operated metal valves and manually operated metal line-stopping valves not being parts of machines which stop the flow of water or gas in water pipes, gas pipes, and petro-chemical pipes used for industrial purposes; valve systems comprised of manually operated metal valves for use in water pipes, gas pipes, and petro-chemical pipes used for industrial purposes

'chemic':34,58 'compris':42 'flow':21 'gas':25,29,53 'industri':38,62 'line':10 'line-stop':9 'machin':17 'manual':1,6,44 'metal':3,8,46 'oper':2,7,45 'part':15 'petro':33,57 'petro-chem':32,56 'pipe':28,30,35,52,54,59 'purpos':39,63 'stop':11,19 'system':41 'use':36,49,60 'valv':4,12,40,47 'water':23,27,51

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