Manually operated metal valves; metal valves, not including machine elements, for use in diverting, distributing, throttling, and damming up petrol, natural gas, fresh water, sewage, seawater, and caustic acid or alkaline mediums, in industries of petroleum, chemical, metallurgy, electricity, food and city building

'acid':29 'alkalin':31 'build':43 'caustic':28 'chemic':37 'citi':42 'dam':18 'distribut':15 'divert':14 'electr':39 'element':10 'food':40 'fresh':23 'gas':22 'includ':8 'industri':34 'machin':9 'manual':1 'medium':32 'metal':3,5 'metallurgi':38 'natur':21 'oper':2 'petrol':20 'petroleum':36 'seawat':26 'sewag':25 'throttl':16 'use':12 'valv':4,6 'water':24

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