Building materials of metal, namely, housings of machines, namely, metal depository housings sold empty that may be used to contain industrial cleaning and surface processing components; transportable buildings of metal; water treatment equipment, namely, drainage basins, dip basins and washbasins of metal for collecting and storing water for industrial purposes and for disposal of wastewater; frames of metal for building; metal rails; pipes of metal; pipes of stainless steel, copper and alum...