Sand, gravel, crushed stone, asphalt, bitumen, cement, gypsum for use in construction, road construction, repair and covering work; building materials as finished products, namely, slabs, pre-cast wall forms, poles, made of concrete, gypsum, clay, potters' clay, natural or artificial stone, wood, plastics and synthetic materials for building, construction, road construction purposes; portable non-metallic buildings; non-metallic building materials in the nature of soffits, fascia, shutters; non-metallic transportable buildings, poles not of metal for power lines; pedestrian traffic control barriers not of metal; 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; natural and synthetic surface coatings in the form of panels and sheets, being building materials; heat adhesive synthetic surface coating, being building materials; bitumen cardboard coatings for roofing; bitumen coating for roofing; building glass; prefabricated swimming pools not of metal as structures; aquarium sand