Sales of hoisting machinery and its components, construction machinery and its components, steel structural parts and three-dimensional warehouses, construction machinery, port loading and unloading systems and equipment, automatic logistics storage systems, material handling and transportation systems produced by the company; Sales of mechanical and electrical equipment (excluding projects without special permission); Engaged in the wholesale and import and export business of similar commodities of the above products (not involving state-owned trade management commodities, involving quota and license management commodities, the application shall be handled according to the relevant provisions of the state); Technology development, technology transfer, technical consultation and technical service of electromechanical products; Affiliated to the company's own crane leasing business. (for projects subject to approval according to law, business activities can only be carried out after approval by relevant departments)