Manufacturing of special equipment; Construction engineering construction; Inspection and testing services; Production of prestressed concrete railway bridge simply supported beams; Production of construction steel bar products; Installation, modification, and repair of special equipment; Interior residential decoration. General items: Manufacturing of metal structures; Manufacturing of construction machinery; Manufacturing of new building materials (excluding hazardous chemicals); Sales of building materials; Manufacturing of molds; Sales of molds; Leasing of mechanical equipment; Processing of mechanical parts and components; Manufacturing of general parts; Retail of hardware products; Sales of special labor protection supplies; Operation of wires and cables; Sales of building decoration materials; Manufacturing of railway rolling stock parts; Sales of power electronic components; Sales of high-speed rail equipment and accessories; Sales of rail transit engineering machinery and parts; Manufacturing of specialized machinery for building materials production; Manufacturing of mining machinery; Manufacturing of specialized machinery for tunnel construction; Manufacturing of agricultural machinery; Manufacturing of metal materials; Manufacturing of urban rail transit equipment; Manufacturing of concrete structural components; Manufacturing of lightweight building materials; Residential water and electrical installation and maintenance services.