19 Building materials, namely, glazed ceramic tiles, marble, granite, natural and artificial stone, bricks, tiles namely, nonmetal tiles, roof tiles, namely, nonmetal roof tiles, cement, lime, namely, lime building materials, mortar, plaster and gravel, earthenware and cement tubes, road building materials, namely, cement mixes, asphalt, pitch and bitumen, mobile homes, monuments of stone, chimneys, namely, non-metal chimneys, semi-worked timber; building timber, beams, namely, wooden beams, planks, panels, namely, non-metal floor panels, veneers, namely, wooden veneers, plywood, building glass, sheets of glass, tiles of glass, flooring, namely, wood flooring, and coverings, namely, non-metal coverings for buildings and for building construction in general