Special equipment manufacturing. (Projects that require approval by relevant authorities can only be carried out after obtaining the approval, and the specific business projects are subject to the approval documents or permits issued by the relevant authorities) General projects: sales of new energy prime movers; general equipment repair; machinery and equipment leasing; sales agency; manufacture of hardware products; sales of pumps and vacuum equipment; wholesale of hardware products; general equipment manufacturing (excluding special equipment manufacturing); sales of hydraulic power machinery and components; research and development of distribution switch control equipment; manufacture of electronic dedicated equipment; sales of springs; instrument and meter repair; electrical equipment repair; sales of pneumatic power machinery and components; manufacture of gas compression machinery; sales of gas compression machinery; manufacture of gas and liquid separation and purification equipment; sales of gas and liquid separation and purification equipment; sales of special equipment; manufacture of pumps and vacuum equipment; manufacture of pneumatic power machinery and components; sales of industrial automatic control system devices; sales of valves and cocks; sales of lubricating oil; design, manufacture, installation, and maintenance: chemical machinery and equipment, electromechanical equipment, machinery and equipment; sales: chemical machinery and equipment, compressor sets, electromechanical equipment and spare parts, electrical components, hardware and electrical appliances, electromechanical products, communication equipment (excluding radio ground receiving and transmitting equipment), household appliances; design, manufacture, and sales of secondary water supply equipment; engaging in construction-related business (practicing with a qualification certificate); technical consulting services; import and export business: technology development and technical consultation in the Internet field; cleaning services. [Projects that require approval by relevant authorities can only be carried out after obtaining the approval]