3504001 Girders and beams, metal, I shaped 3504002 Girders and beams, metal, H shaped 3504003 Girders and beams, metal, honeycomb 3504004 Girders and beams, metal, welded 3504005 Girders, metal, box section 3504006 Girders, metal, haunch 3504008 Girders, lattice, steel 3504009 Girders, plate, built up, steel 3504010 Girders, metal, extensible 3504013 Girders and beams, metal, for concrete floor reinforcement 3504015 Trusses, metal 3504016 Roof trusses, metal 3504018 Purlins, metal 3504019 Lintels, metal 3504022 Arches, metal 3504024 Pile casings, steel 3504026 Steel tubulars 3504027 Space frame structures, metal 3504030 Load-bearing units, metal, prefabricated 3504031 Frames, iron and steel, structural, for prefabricated buildings 3504032 Frames, tubular metal, for buildings and building elements 3504033 Structural metal fabrications, honeycomb, for the building industry 3504040 Mezzanine floors, metal 3504053 Structural light metal fabrications to customer specification 3504055 Structural steel fabrications to customer specification
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