Manufacturing of specialized equipment for oil drilling and extraction; sales of agricultural machinery; sales of mechanical parts and components; retail of electronic components; sales of electronic components and electromechanical component equipment; sales of power electronic components; sales of mechanical and electrical equipment; sales of hydraulic power machinery and components; manufacturing of hydraulic power machinery and components; manufacturing of hydraulic and pneumatic components and systems; sales of pneumatic power machinery and components; manufacturing of pneumatic power machinery and components; retail of hardware products; sales of railway locomotive and rolling stock parts; import and export of goods; sales of machine tool functional parts and accessories; sales of refrigeration and air conditioning equipment; repair of general equipment; sales of gas compression machinery; manufacturing of specialized water resource mechanical equipment; sales of fans and blowers; retail of automotive parts; sales of high-speed rail equipment and accessories; installation and repair of industrial robots; manufacturing of industrial robots; sales of industrial robots; sales of intelligent robots; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; power generation technical services; motor vehicle repair and maintenance; maintenance of electronic and mechanical equipment (excluding special equipment); installation services for general mechanical equipment; installation services for household appliances; water environment pollution prevention services; sales of valves and cocks; sales of power distribution switchgear equipment; sales of marine engineering equipment; sales of special equipment; sales of mechanical equipment; sales of material handling equipment; leasing of mechanical equipment. Licensed items: hydropower generation; installation, modification, and repair of special equipment.