19 Manufactured timber; non-metallic minerals for building or construction, as far as unprocessed; building glass; structures, namely, aquaria; tiles and paving slabs, not of metal; non-luminous and non-mechanical signs, not of metal; advertisement columns, not of metal; monuments, not of metal; diving boards, not of metal; rocket launching platforms, not of metal; insect screens, not of metal; non-metal artificial fish reefs; prefabricated non-metal buildings; pre-fabricated non-metal pigsties; non-metal railroad ties; tiles, not of metal; works of art of stonemasonry; building stone; storage tanks of masonry; statues of stone, concrete or marble; building materials, namely, manufactured cement; asphalt, pitch and bitumen; agglomerated cork for building; outdoor blinds, not of metal and not of textile; monuments of concrete; tar; paint spraying booths, not of metal; building materials made of synthetic elements