Sand, gravel, crushed stone, asphalt, bitumen, cement, gypsum, plaster, concrete, marble blocks for construction, included in this class; 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: non-metallic buildings, non-metallic building materials, poles, not of metal for power lines, barriers not of metal; natural and synthetic coverings in the form of panels and sheets, being building materials; bitumen cardboard for roofing; bitumen covering 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 (structures); aquarium sand.