... ETC. The Brief IntroductionCangzhou Spiral Steel Pipe Co., Ltd located at No.92 JieFang East Road ... Co., LTD, Cangzhou Double Dragon Steel Pipe Co., Ltd., Cangzhou Derry Fengda International Trade Co., LTD. and Cangzhou OK Anticorrosion Thermal Insulation Project Co.,LTD., Cangzhou Spiral Steel Pipe Co., LTD ... and service” by State Economic and Trade Commission and State Administration of Industry and ...