19 Articles of cement for construction purposes, namely, cement beams, blocks, piers and slabs; articles of concrete for construction purposes, namely, beams, slabs, piers, piles, posts, panels, bridge abutments, decks, and headstocks in the nature of bridge foundations; concrete constructional panels; concrete constructional sheets, namely, concrete panels; construction materials, not of metal, namely, supports, formwork, and non-metallic reinforcements for concrete construction, namely, plates, rods and bars; constructional components of reinforced cement mortar, namely, non-metallic reinforcements for concrete bridge parts, namely, plates, rods, and bars; expanded plastics for use in construction, namely, plastic conduits for irrigation and drainage; modular prefabricated building units, namely, non-metal modular, prefabricated buildings and building sections; non-metal, modular, structural building sections for the assembly of prefabricated buildings; non-metallic construction materials, materials for construction and materials for use in building construction, namely, non-metal reinforced concrete panels; non-metallic construction sheets, namely, non-metal formwork sheeting for construction use; non-metallic materials for use in the construction of roads, namely, concrete; non-metallic materials for use in the construction of walls, namely, concrete panels; non-metallic concrete panels for use in construction of floors; non-metallic structural sections for construction purposes, namely, concrete wall and floor sections; non-metallic transportable constructions; non-metal wall paneling for use in construction; prefabricated non-metallic buildings