Manufacturing of household elevators and elevators; Manufacturing of gas compression machine; Metal processing machine manufacturing; Foundry machinery manufacturing; Processing of Machine element and spare parts; Metal tool manufacturing; General equipment manufacturing (excluding special equipment manufacturing); Manufacturing of industrial automatic control system devices; Sales of mechanical equipment; Sales of pneumatic power machinery and components; Sales of Machine Element and spare parts; Sales of gas compression machine; Sales of casting machine; Sales of instruments and meters; Sales of Construction Machinery; Retail of hardware products; Sales of building materials; Mechanical equipment leasing (except for projects that require approval in accordance with the law, operating activities can be carried out independently with the business license in accordance with the law) License project: special equipment manufacturing; Special equipment installation, renovation, and repair (projects that require approval according to law can only be carried out after being approved by relevant departments. The specific business projects should be subject to the approval results)