General items: General parts manufacturing; Agricultural machinery manufacturing; Sales of mechanical equipment; Mechanical equipment leasing; Research and development of mechanical equipment; Manufacturing of mechanical and electrical equipment; Sales of metal chains and other metal products; Sales of machine tool functional parts and accessories; Sales of railway transportation infrastructure; Metal structure sales; Sales of electrical instruments and meters; Sales of electrical equipment; Maintenance of electronic and mechanical equipment (excluding special equipment); Hardware product manufacturing; Wholesale of hardware products; Retail of hardware products; Mold sales; Mold manufacturing; Manufacturing of metal materials; Manufacturing of building decoration, plumbing pipe parts and other building metal products; Research and development of metal products; Sales of metal products; Auto parts retail; Wholesale of auto parts; General mechanical equipment installation services; Furniture installation and maintenance services; General equipment repair; Engineering management services; Sales of building materials; Information consulting services (excluding licensed information consulting services); Sales of metal forming machine tools; Manufacturing of forgings and powder metallurgy products; Metal forming machine tool manufacturing; Sales of forgings and powder metallurgy products( In addition to the projects that must be approved according to law, the licensed projects shall carry out business activities independently according to law with the business license: Various engineering construction activities; Import and export of goods; Technology import and export; Import and export agent( For projects that must be approved according to law, business activities can be carried out only with the approval of relevant departments. The specific business projects shall be subject to the approval documents or licenses of relevant departments)