19 Wood, semi-worked; plywood; wood for making household utensils; wood veneers; wood panelling; wooden flooring; boards of wood; floor tiles of wood; slate; potters' clay; marble; artificial stone; pottery stone; building materials of natural stone; bricks; mosaics for building; tiles, not of metal, for building; floor tiles, not of metal; tile floorings, not of metal; wall tiles, not of metal; terrazzo; ceramic tiles; ceramic wall tiles; earthenware tiles; earthenware wall tiles; glass bricks; glass bricks (not for roofs); paving blocks, not of metal; earthenware floor tiles; ceramic tiles for flooring and facing; ceramic tiles for flooring and lining; mosaic floor tiles; terra-cotta floor tiles; glazed ceramic tiles; semi-refractory bricks, not of metal; glazed ceramic floor tiles; balustrades, not of metal; partitions, not of metal; windows, not of metal; doors, not of metal; water-pipes, not of metal; water-pipe valves, not of metal or plastic; branching pipes, not of metal; props, not of metal; laths, not of metal; parquet flooring; shutters, not of metal; floors, not of metal; ceilings, not of metal; gates, not of metal; door panels, not of metal; drain pipes, not of metal; penstock pipes, not of metal; acoustic panels, not of metal; polyethylene pipes used in geothermal heating and cooling systems; sewer pipes, not of metal; ceramic drain pipes; clapboard, not of metal; security gates, not of metal; buildings, not of metal; aquaria [structures]; statues of stone, concrete or marble; works of art of stone, concrete or marble.