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, namely, concrete, plaster, lime building materials, heat-resistant cement, white cement, plaster, cast for building purposes, ready-mixed concrete, artificial stones, surface coatings containing natural and artificial stones for use in constructing interior walls, facades, and floors, tiles and glazed tiles not of metal, flagstones, kerb stones, concrete pipes, roofing cement, transportable precast concrete buildings and structural elements therefor, concrete poles for use in building and construction, concrete fence pickets, concrete poles for power lines, concrete poles for electric communication lines, concrete barriers for building purposes, concrete king posts; prefabricated non-metallic buildings; non-metallic building materials, namely, concrete, plaster, lime building materials, heat-resistant cement, white cement, plaster, cast for building purposes, ready-mixed concrete, artificial stones, surface coatings containing natural and artificial stones for use in constructing interior walls, facades, and floors, tiles and glazed tiles not of metal, flagstones, kerb stones, concrete pipes, roofing cement, transportable precast concrete buildings and structural elements therefor, concrete poles for use in building and construction, concrete fence pickets, concrete poles for power lines, concrete poles for electric communication lines, concrete barriers for building purposes, concrete king posts; non-metallic transportable buildings, poles not of metal for power lines, barriers not of metal, namely, portable non-metal free-standing barriers; doors and windows of wood; 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, namely, concrete panels, non-metal floor panels, non-metal roofing panels, non-metal fencing panels, non-metal door panels, non-metal ceiling panels, composite panels composed primarily of nonmetal materials, and facing sheets of plywood