Sand, gravel, crushed stone, asphalt, bitumen, cement, gypsum for use in construction, and road construction, building materials (as finished products) made of concrete, gypsum, clay, potters' clay, natural or artificial stone, wood, plastics and synthetic materials for building, construction, and road construction purposes, included in this class; non-metallic buildings, non-metallic building materials, non-metallic transportable buildings, poles not of metal for power lines, 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; prefabricated swimming pools not of metal (structures)