Business project: Construction engineering construction; Special equipment manufacturing; Special equipment installation, renovation, and repair; Metal structure manufacturing; Sales of metal structures; Sales of building materials; Manufacturing of metal materials; Sales of metal materials; Research and development of new material technology; Sales of building materials; Manufacturing and processing of doors and windows; Construction of metal door and window engineering; Sales of doors and windows; Manufacturing of metal fittings for construction purposes; Mechanical parts and component processing; Manufacturing of metal cutting and welding equipment; Sales of metal cutting and welding equipment; Research and development of metal products; Intelligent manufacturing equipment manufacturing; General equipment manufacturing; New material technology promotion services;