19 Cement, namely filling cement, cement mixes, concrete, concrete building materials, namely blocks, bricks, stones, columns, walls, conduit, pipes, ducts, panels, posts, bases, pedestals, slabs, fences, beams, planks, boxes, and basins and masonry building materials, namely blocks, bricks, stones, walls, posts, columns, walls, conduit, pipes, ducts, panels, posts, pedestals, containers, curbs, bases, slabs, fences, beams, planks, boxes and basins