Manufacture of railway locomotive and rolling stock parts; manufacture of high-speed railway equipment and parts; manufacture of marine supporting equipment; manufacture of urban rail transit equipment; manufacture of power facility equipment; manufacture of mechanical and electrical equipment; research and development of motors and their control systems; manufacture of power distribution switchgear equipment; manufacture of photovoltaic equipment and components; production of battery parts; manufacture of transmission, distribution, and monitoring control equipment; manufacture of intelligent vehicle-mounted equipment; manufacture of smart home consumer equipment; manufacture of semiconductor lighting devices; manufacture of servo control mechanisms; manufacture of specialized instruments; manufacture of testing machines; manufacture of other general instruments; manufacture of intelligent basic manufacturing equipment; manufacture of industrial automatic control system devices; repair of instruments and meters; repair of electrical equipment; maintenance of transportation facilities; repair of general equipment; installation and repair of industrial robots; water pollution control; installation services for environmental sanitation public facilities; repair of computers and office equipment; repair and maintenance of motor vehicles; non-residential real estate leasing.