Sand, gravel, crushed natural stone, asphalt, bitumen, cement, gypsum board, plaster, concrete, and marble blocks for construction; building materials as finished products, namely, composite panels composed primarily of concrete, gypsum, clay, potters' clay, stone, marble, wood, plastics and synthetic materials for building, construction, road construction purposes; non-metallic transportable buildings; non-metallic building materials, namely, fiberglass panels, floor boards, fascia; poles not of metal for electric power lines, crash barriers not of metal; natural and synthetic coatings in the nature of non-metal ceiling and floor panels and sheets, being building materials; bitumen cardboard coatings for roofing; bitumen coating for roofing; doors and windows of wood and synthetic materials; traffic signs not of metal, non-luminous and non-mechanical, for roads; monuments and statuettes of stone, concrete and marble; building glass; prefabricated swimming pools not of metal; aquarium sand