Sand, gravel, crushed stone, asphalt, bitumen, cement, gypsum for use in construction, road construction, repair and covering work; building materials (as finished products) made of concrete, gypsum, clay, potters' clay, natural or artificial stone, wood, plastics and synthetic materials for building, construction, road construction purposes, included in this class; non-metallic building materials, non-metallic transportable buildings; masts poles, not of metal; barriers not of metal, doors a...