Sand, gravel, crushed stone, asphalt, bitumen, cement, gypsum, plaster, concrete, marble blocks, all for construction purposes; building materials as finished products made of concrete, gypsum, clay, potters' clay, stone, marble, wood, plastics and synthetic materials for building, construction, road construction purposes, included in this class, namely, panels, boards, walls, divisions being dividers, wallboard, tiles, coatings, framework, moldings; non-metallic transportable or prefabricate...