Ducts of metal for ventilating and air conditioning installations; Ducts of metal, for central heating installations; Junctions of metal for pipes; Manifolds of metal for pipelines; Manually operated metal valves; Pipes of metal, for central heating installations; Signboards of metal; Steel pipes; Tubes of metal; Valves of metal, other than parts of machines; Water-pipe valves of metal; Water-pipes of metal

'air':7 'central':14,35 'condit':8 'duct':1,10 'heat':15,36 'instal':9,16,37 'junction':17 'machin':53 'manifold':22 'manual':27 'metal':3,12,19,24,29,33,40,45,48,59,64 'oper':28 'part':51 'pipe':21,31,42,56,62 'pipelin':26 'signboard':38 'steel':41 'tube':43 'valv':30,46,57 'ventil':5 'water':55,61 'water-pip':54,60

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