19 Building materials, namely,ceramictiles,natural stone, artificial stone, sandstone, stone veneer, concrete, preserved wood, wood veneer, semi-worked wood,wall boards, floor boards, hardwood boards,decking,wood boards,concrete andconcreteparticle boards, slates for wall cladding, wall panels, precast concrete wall forms, mosaic tiles,glass mosaics for building,clinker in the nature of pre-cast concrete, facade panels for construction purposes, building glass, glass panes, sheet glass, decorative panels of stone, concrete and wood, not of metal; ceramic wall panels and tiles for construction purposes; ceramic tiles for external floors; ceramic tiles for internal floors; ceramic tiles for external walls; ceramic tiles for flooring of building; ceramic wall tiles; ceramic roofing tiles; glazed ceramic tiles; ceramic paving and surfacing tiles; ceramic tiles for flooring and lining; ceramic tiles for internal walls; sintered ceramic wall, ceiling and floor plates for use in building; large-format sintered ceramic wall, ceiling and floor plates for use in building