Manufacturing of fasteners; sales of fasteners; manufacturing of metal chains and other metal products; manufacturing of hardware products; sales of valves and cocks; mechanical parts and parts processing; sales of plastic products; wholesale of automobile parts and accessories; manufacturing of automobile parts and accessories; sales of metal materials; wholesale of motorcycles and spare parts; mold manufacturing; mold sales; retail of electronic components; sales of machinery and equipment; sales of construction materials; Internet sales (except for the sale of goods that require a license); Sales of Class I medical devices; sales of electronic special equipment; manufacturing of construction metal accessories; manufacturing of railway rolling stock accessories; sales of offshore wind power related equipment; manufacturing of architectural decoration, plumbing pipe parts and other metal products for construction; manufacturing of general parts and components; technical services, technology development, technical consultation, technology exchange, technology transfer, and technology promotion; manufacturing of marine supporting equipment; sales of wind turbines and parts; import and export of goods; import and export of technology