Manufacturing of railway locomotive and rolling stock parts; Manufacturing of urban rail transit equipment; Manufacturing of high-speed rail equipment and parts; Manufacturing of marine supporting equipment; Manufacturing of general parts; Manufacturing of hydraulic power machinery and components; Manufacturing of hydraulic and pneumatic components and systems; Manufacturing of general equipment (excluding special equipment); Manufacturing of mechanical and electrical equipment; Manufacturing of electronic components; Manufacturing of industrial automatic control system devices; Research and development of electronic专用 materials; Manufacturing of electronic专用 materials; Manufacturing of intelligent instruments and meters; Manufacturing of refrigeration and air conditioning equipment; Manufacturing of metal wire ropes and their products; Spray coating processing; Production of refractory materials; Sales of refractory materials; Research and development of mechanical equipment; Sales of mechanical equipment; Leasing of mechanical equipment; Industrial design services; Technical services, development, consulting, exchange, transfer, and promotion; Sales agency; Domestic trade agency; Import and export of goods; Import and export of technology.