INVISIBLE CONNECTIONS

Common metals and their alloys; metal building materials, namely, metal hinges, [ metal hooks, ] and steel supports for imbedding in concrete and other building materials to connect and strengthen them; [ transportable buildings of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; small items of metal hardware, namely, bolts, nuts, and washers; pipes and tubes of metal; ] metal safes

[ Rubber, gutta-percha, gum, asbestos, and mica; plastics in extruded form for use in manufacture; packing, stopping and insulating materials; flexible pipes, not of metal ]

[ Non-metallic building construction materials, namely, plastic pipe supports, fly ash, semi-worked woods, and plastic supports for imbedding in concrete and other building materials to connect and strengthen them; non-metallic rigid pipes for building; asphalt, pitch, and bitumen; non-metallic transportable buildings; non-metal monuments of stone, concrete, and marble ]