Crushed stone, asphalt, marble blocks for construction, included in this class; clay, potters' clay, marble, wood, road construction purposes, included in this class, 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; building glass; prefabricated swimming pools not of metal (structures); aquarium sand.