Angle irons, not of metal; roof flashing, not of metal; slate; reinforcing materials, not of metal, for building; asphalt; pitch; tar; bitumen; balustrades, not of metal; cabanas, not of metal; fireplace mantles, not of metal; paperboard for building; plywood; roofing, not of metal; cornices, not of metal; non-metallic transportable buildings; prefabricated non-metal buildings; windows, not of metal; stair treads not of metal; granite; latticework, not of metal; door frames, not of metal; pav...