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...