Manufacturing and sales of railway locomotive and vehicle parts, urban rail transit equipment, automotive parts, electrical mechanical equipment, general mechanical equipment, and molds; general mechanical equipment installation services, mechanical equipment maintenance (excluding special equipment); construction engineering construction; mechanical equipment research and development; steel rolling and processing; production, processing, and sales of precision castings; sales of steel, ferrous metals, and non-ferrous metals; machine tool processing; recycling of productive scrap metal; recycling of renewable resources (excluding productive scrap metal); additional production and operation address: West of Ximazhuang Village, Ranzhuang Town, Qingyuan District, Baoding City, Hebei Province; manufacturing of general valves and cocks (excluding special equipment manufacturing); sales of valves and cocks; manufacturing of pneumatic power machinery and components; sales of pneumatic power machinery and components; manufacturing of hardware products; wholesale of hardware products; technology import and export; goods import and export.