19 Partitions with non-metallic frames, partitions, not of metal, construction materials, not of metal, namely, braces, prefabricated buildings, not of metal, reinforcing materials, not of metal, for building purposes, building materials, not of metal, namely, composite panels; window frames, not of metal, door frames, not of metal, tiles, not of metal, for building, framework, not of metal, for building, window sashes, not of metal, sliding-door frames, not of metal, staircases, not of metal, windows, not of metal, door jambs, not of metal, wainscotting, not of metal, parquet floor boards, not of metal, laths, not of metal, stair-treads, not of metal, wall cladding, not of metal for building, building panels, not of metal, wall linings, not of metal, for building, parquet flooring, non-metal ceiling panels, non-metal covering for ceilings; floors, not of metal, door panels, not of metal, doors, not of metal, posts, not of metal, palings, not of metal, joists, not of metal, beams, not of metal, tile floorings, not of metal, framework, not of metal, for building, fences, not of metal, ducts, not of metal, for ventilating and air-conditioning installations, transportable buildings, not of metal, cornices, not of metal, non-metal angle iron bars, gutters, not of metal, roof coverings, not of metal, roofing, not of metal, slabs, not of metal, tiles, not of metal, jalousies, not of metal, porches, not of metal for building, lintels, not of metal, shutters, not of metal, sheet glass for building, insulating glass for building, window glass, except glass for vehicle windows, stained-glass windows