General business scope: Sales of pumps and vacuum equipment; Sales of valves and plugs; Sales of gas compression machinery; Sales of mechanical equipment; Sales of electronic components and electromechanical components; Sales of mechanical parts and components: Wholesale of hardware products: Retail of hardware products: Sales of lubricants: Sales of refrigeration and air conditioning equipment: Sales of environmental protection equipment: Repair of general equipment; Ordinary mechanical equipment installation services: Mechanical equipment leasing: Technical services, technology development, technology consulting, technology exchange, technology transfer, technology promotion: Import and export of goods: Import and export of technology. (Except for projects that require approval according to law, conduct business activities independently based on the business license in accordance with the law)