General items: Manufacture of general equipment (excluding special equipment manufacturing); sales of gears, gear reducers, and gearboxes; sales of bearings, gears, and transmission components; manufacture of bearings, gears, and transmission components; manufacture of bearings; manufacture of gears, gear reducers, and gearboxes; repair of general equipment; manufacture of high-speed rail equipment and accessories; manufacture of railway locomotive and rolling stock accessories; sales of railway locomotive and rolling stock accessories; sales of high-speed rail equipment and accessories; sales of special equipment; manufacture of electric motors; manufacture of mechanical and electrical equipment; manufacture of electric motors; sales of electric power dynamometers; manufacture of general parts; processing of mechanical parts and components; sales of mechanical parts and components; sales of rail transit special equipment, key systems, and components; technology import and export; import and export agency; import and export of goods; leasing of mechanical equipment; leasing services (excluding licensed leasing services); technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; leasing of non-residential real estate; business training (excluding education and training, vocational skills training, etc. that require licensing); manufacture of urban rail transit equipment; sales of rail transit engineering machinery and parts. Licensed items: Manufacture of special equipment; design of special equipment; installation, modification, and repair of special equipment.