Manufacturing of metal structures; sales of metal structures; manufacturing of metal wire ropes and their products; sales of metal wire ropes and their products; manufacturing of metal chains and other metal products; sales of metal chains and other metal products; research and development of metal products; sales of metal products; manufacturing of metal materials; sales of metal materials; non-ferrous metal casting; manufacturing of automobile wheels; manufacturing of railway locomotive and vehicle parts; sales of railway locomotive and vehicle parts; manufacturing of auto parts and accessories; research and development of auto parts; wholesale of auto parts; manufacturing of high-speed rail equipment and accessories; sales of high-speed rail equipment and accessories; spray coating processing; metal cutting processing services; research and development of new material technology; promotion of new material technology services; sales of solar thermal power generation products; solar power generation technical services; leasing of photovoltaic power generation equipment; manufacturing of general parts; manufacturing of general equipment (excluding special equipment manufacturing); non-residential real estate leasing; toy manufacturing; toy sales; bicycle manufacturing; sales of non-road leisure vehicles and parts; manufacturing of non-road leisure vehicles and parts; recycling of productive scrap metal; processing of metal waste and scrap; goods import and export; import agency; technology import and export; manufacturing of special equipment (excluding licensed professional equipment manufacturing); sales of special equipment for oil drilling; manufacturing of special equipment for oil drilling; manufacturing of deep-sea oil drilling equipment; sales of deep-sea oil drilling equipment; research and development of mechanical equipment; manufacturing of synthetic materials (excluding hazardous chemicals); sales of synthetic materials; technical services, technology development, technical consulting, technical exchange, technology transfer, and technology promotion; sales of casting molding materials; sales of chemical products (excluding licensed chemical products); sales of high-performance fibers and composite materials; sales of refractory materials; sales of high-quality synthetic rubber; sales of metal matrix composites and ceramic matrix composites; manufacturing of special ceramic products; sales of rare earth functional materials; production of refractory materials; sales of special ceramic products; manufacturing of high-performance fibers and composite materials; sales of non-ferrous metal alloys; manufacturing of non-ferrous metal alloys; oil and gas technical services.