Power supply business; Special equipment installation, modification and repair; Scrapped electric vehicle recycling and dismantling; Scrapped motor vehicle recycling; Scrapped motor vehicle dismantling. General items: Ferrous metal casting; Metallurgical special equipment manufacturing; Special equipment manufacturing (excluding licensed professional equipment manufacturing); Tunnel construction special machinery manufacturing; Construction machinery and equipment leasing; Construction machinery manufacturing; Mechanical equipment sales; Automobile wheel hub manufacturing; Railway locomotive vehicle parts manufacturing; High-speed rail equipment and accessories manufacturing; Mechanical equipment research and development; Mechanical parts and components processing; Mechanical parts and components sales; Rail transit special equipment, key systems and parts sales; Housing leasing; Technical services, technology development, technical consultation, technical exchange, technology transfer, and technology promotion; Technology import and export; Import and export of goods; Special equipment sales; Special equipment leasing; Forging and powder metallurgy product manufacturing; Forging and powder metallurgy product sales; Mechanical equipment leasing; Auto parts and accessories manufacturing; Auto parts research and development; High-speed rail equipment and accessories sales; Urban rail transit equipment manufacturing; Rail transit engineering machinery and parts sales; Auto parts remanufacturing; Renewable resource sales; Production scrap metal recycling; Scrapped agricultural machinery recycling; Renewable resource processing; Renewable resource recycling (excluding production scrap metal); Metal waste and scrap processing; Metal structure manufacturing; Resource recycling technology research and development; Non-ferrous metal alloy sales; New material technology research and development; Non-ferrous metal alloy manufacturing; Metal material manufacturing; Metal material sales