Manufacturing of fasteners; sales of fasteners; manufacturing of building decoration, plumbing pipe fittings, and other metal products for construction; sales of metal products; manufacturing of hardware products; wholesale of hardware products; manufacturing of metal structures; sales of metal structures; manufacturing of power facility accessories; sales of power facility accessories; manufacturing of photovoltaic equipment and components; sales of photovoltaic equipment and components; manufacturing of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; manufacturing of metal signs for traffic and public management; sales of signs for traffic and public management; manufacturing of metal fittings for construction; sales of metal fittings for construction; sales of labor protection supplies; sales of metal materials; sales of plastic products; sales of rubber products; sales of building materials; sales of mechanical equipment; wholesale of automotive parts; sales of chemical products (excluding licensed chemical products); sales of electrical equipment; sales of instruments and meters; sales of fire protection equipment; operation of wires and cables; sales of building decoration materials; sales of valves and cocks; sales of molds; sales of mechanical parts and components; sales of electronic products; import and export of goods.