Unwrought and semi-wrought common metals and their alloys; steels and stainless steels; transportable buildings of metal; sheet metal; cables and wires of metal; powdered common metals and their alloys; copper powder; zinc powder

Treatment of metals and their alloys and mechanical, thermomechanical or chemical transformation of metal properties and characteristics, namely, treatment of metals, hardening of metals; metal tempering; metal surface finishing for others; welding; chromium plating; nickel plating; tin plating; galvanization; metal armor plating; shaping and assembly of metal components being assembly of products for others; welding of metals; metal goods forging to the order and specification of others, pre...