Tuberías, tubos, conductos y tuberías, de acero, Tuberías de metal, válvulas y contenedores, Construcción, Pipes, tubes, ducts and pipelines, steel, Metal pipework, valves and containers, Construction, Tubes, steel, for the motor vehicle industry, Pipes and tubes, steel, fusion welded, Tubes, steel, for furniture, Pipes, tubes, ducts and pipelines, ferrous metals, by use