Manufacturing of general valves and plugs (excluding special equipment manufacturing); sales of valves and plugs; research and development of valves and plugs; manufacturing of hardware products; repair of general equipment; manufacturing of general equipment (excluding special equipment manufacturing); manufacturing of industrial automatic control system devices; sales of industrial automatic control system devices; sales of special equipment; leasing of special equipment; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; road freight transport of general cargo vehicles with a total mass of 4.5 tons or less (excluding network freight and dangerous goods); import and export of goods; import and export of technologies; manufacturing of rubber products; sales of rubber products; sales of metal products; retail of hardware products; repair of specialized equipment. Licensed items: manufacturing of special equipment; inspection and testing of special equipment; installation, modification, and repair of special equipment; construction engineering construction.