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Ysd-85/800 Steel Band Type Round Air Tube Galvanized Steel Spiral Duct Machine for HAVC Duct Making, Find Details and Price about Spiral Duct Former Spiral Duct Forming Machine from Ysd-85/800 Steel Band Type Round Air Tube Galvanized Steel Spiral Duct Machine for HAVC Duct Making - Nanjing Shanduan Cnc Machine Tool Co., Ltd.