Buildings, transportable, not of metal; non-metallic transportable buildings; building panels, not of metal; concrete building elements in the nature of poles for use in building, concrete bollards, concrete beams, concrete blocks, concrete blocks with insulating core, concrete panels, concrete pipes, concrete walls, concrete floors; refractory construction materials, not of metal , namely, refractory mortars, refractory bricks, refractory blocks, semi-refractory bricks, refractory shapes; mo...