12 PREFABRICATED BUILDING ELEMENTS-NAMELY, OUTER COVER ELEMENTS FOR THE OUTSIDE OF BUILDINGS MADE FROM ALUMINUM OR PLASTICS, ALUMINUM COLD-ROLLED COVERING PLATES, CURTAIN WALL TYPE FACADES, LIGHT AND HEAVY FACADE PANELS; WINDOWS OF ALL TYPES, EXTRUDED LIGHT ALLOY STRUCTURAL ELEMENTS FOR WINDOWS, FRONT DOORS AND INSIDE DOORS; CEILINGS-NAMELY, PERFORATED LIGHT ALLOY SOUNDPROOF CEILINGS, PLASTERBOARD CEILINGS, INTEGRATED CEILINGS, LAMINATE CEILINGS; INTERIOR WALLS, METAL AND WOOD MOBILE PARTITIONS, PLASTERBOARD WALLS; ELEVATED FLOORS; EQUIPMENT-NAMELY, TOILET PARTITIONS; WALL CLOSETS, VERTICAL FABRIC CURTAINS, STRUCTURES-NAMELY, PLATES AND HOOKS FOR FOUNDATIONS, MODULAR AND STRUCTURAL ELEMENTS FOR BUILDING SYSTEMS UTILIZING STANDARDIZED COMPONENTS, ALUMINUM JOINTS AND TUBULAR ELEMENTS