6 Prefabricated bridge structures of metal, namely, beams of metal; Prefabricated metal bridges; Building structures of metal, namely, metal railings for fences, balconies, bridges and metal mine working platforms; Building structures of metal, namely, transportable, portable, modular buildings of metal; Building structures of metal, namely, framework of metal for building, frames of metal for building and steel frame for building; Building structures of metal, namely, construction elements made of metal, namely, fabricated metal components for building foundations; Building structure extensions of metal, namely, modular metallic buildings to add to existing building structures; Frames of metal for structures, namely, frames of metal for building, greenhouse frames of metal and door frames of metal; Frames of metal for structures, namely, window frames of metal, cold frames of metal and frames of metal for sliding doors; Structural steels, namely, steel rebars, rods, and mesh used for strengthening and reinforcing concrete structures, steel frames for building, steel angles for use in building construction; Structural steels, namely, steel chains, steel wire rope and steel alloys; Structural steelwork, namely, steel pipes and tubes; Structural steelwork, namely, steel plates and sheets; Tank structures of metal, namely, metal storage tanks, industrial water tanks of metal, liquefied gas storage tanks of metal; Tank structures of metal, namely, metal fluid storage tanks; Tank structures of metal, namely, metal storage tanks for mineral processing; Welded metal structures, namely, metal shelter structures, metal structures for mounting solar panels, prefabricated metal structures with flexible covers for agricultural, commercial or industrial storage; Welded metal structures, namely, portable metal structures with flexible covers for agricultural, commercial or industrial storage; Welded metal structures, namely, modular metal structures with flexible covers for agricultural, commercial or industrial storage and metal structures in the nature of ramps for docking and storing boats; Working platforms structures, namely, metal mine working platforms and metal scaffolding; Working platforms structures, namely, metal mine drilling and working platforms; Gratings of metal; Handrails of metal for stairs; Handrails of metal for use in buildings; Handrails of metal for walkways; Chutes of metal for moving cattle, goods, trash, other than parts of machines; Gravity conveyors being chutes of metal for moving cattle, goods, trash; Wear resistant linings of metallic materials being wall linings of metal for building, linings of metal for building, sheet metal linings