Manufacturing of fasteners; Manufacturing of metal structures; Manufacturing of building metal accessories; Manufacturing of railway rolling stock parts; Manufacturing of high-speed rail equipment and accessories; Manufacturing of photovoltaic equipment and components; Manufacturing of automotive parts and accessories; Production of furniture accessories; Manufacturing of power facility equipment; Manufacturing of plastic products; Manufacturing of rubber products; Manufacturing of hardware products; Metal cutting processing services; Manufacturing of metal processing machinery; Manufacturing of metal chains and other metal products; Technical services for wind power generation; Installation services for general mechanical equipment; Leasing of construction machinery and equipment; Research and development of new material technologies; Professional design services; Sales of metal materials; Sales of plastic products; Sales of construction steel bars; Construction of landscaping engineering; Construction of earthwork and stonework engineering; Engineering management services; Foreign contracting projects; Construction of metal doors and windows; Construction of sports venue facilities; Import and export of goods. Licensed items: Construction engineering construction (excluding nuclear power station construction and operation, civil airport construction); Electrical installation services; Construction engineering construction; Installation, maintenance, and testing of transmission, power supply, and power receiving facilities; Construction labor subcontracting.