Manufacturing of general parts; manufacturing of fasteners; sales of fasteners; machining of mechanical parts and components; sales of mechanical parts and components; manufacturing of metal tools; sales of metal tools; manufacturing of molds; sales of molds; metal cutting processing services; research and development of metal products; sales of metal products; manufacturing of metal materials; sales of metal materials; metal surface treatment and heat treatment processing; quenching processing; manufacturing of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; manufacturing of high-speed rail equipment and parts; sales of high-speed rail equipment and parts; manufacturing of automotive parts and accessories; manufacturing of hardware products; research and development of hardware products; wholesale of hardware products; retail of hardware products; manufacturing of metal chains and other metal products; sales of metal chains and other metal products; manufacturing of seals; manufacturing of bearings, gears, and transmission components; repair of general equipment; manufacturing of specialized equipment for oil refining and chemical production; sales of specialized equipment for oil refining and chemical production; manufacturing of metallurgical specialized equipment; sales of metallurgical specialized equipment; manufacturing of industrial robots; sales of industrial robots; installation and repair of industrial robots; manufacturing of industrial automatic control system devices; sales of industrial automatic control system devices; manufacturing of power distribution and control equipment; sales of intelligent power distribution and control equipment; manufacturing of specialized equipment for environmental protection; sales of specialized equipment for environmental protection; manufacturing of specialized equipment for oil drilling; sales of specialized equipment for oil drilling; manufacturing of general equipment (excluding special equipment); research and development of mechanical equipment; sales of mechanical equipment; manufacturing of mechanical and electrical equipment; sales of mechanical and electrical equipment; leasing of photovoltaic power generation equipment; manufacturing of photovoltaic equipment and components; sales of photovoltaic equipment and components; technical services for solar power generation; sales of solar thermal power generation equipment; sales of solar thermal utilization equipment; sales of solar thermal power generation products; sales of solar thermal utilization products; goods import and export; technology import and export. Licensed projects: power generation, transmission, and supply (distribution) business; installation, repair, and testing of transmission, supply, and receiving power facilities.