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Cnc air duct production line is a duct making line with the highest automation and highest efficiency in rectangular air duct production line machines. The air duct production line machine made by LongBow company can help customers to finish all needed process from cutting sheet metal to forming the whole duct under the control of auto CNC system. Automatic CNC control system greatly improves the precision and the beauty... Hydraulic Shearing Machine at Best Price in China.CNC Plasma Cutting Machinery manufacturers, suppliers exporters in China