Manufacture of steam turbines and auxiliary equipment; manufacture of generators and generator sets; manufacture of mechanical and electrical equipment; manufacture of molds; manufacture of metal structures; manufacture of bearings; sales of bearings; sales of valves and cocks; research and development of valves and cocks; manufacture of environmental protection special equipment; sales of environmental protection special equipment; manufacture of railway locomotive and rolling stock parts; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; labor services (excluding labor dispatch); manufacture of general equipment (excluding special equipment); repair of general equipment; sales of metal materials; sales of industrial automatic control system devices; sales of electrical equipment; import and export of goods; leasing of non-residential real estate.