Guerlain Shanghai Mechanical and Electrical Material Co., Ltd. is a professional enterprise engaged in the production and sales of modern industry and construction and installation materials, its always the same spirit of innovation over the years, the company has always been leading the development trend of the industry, the company innovative and advanced products and complete widely used in electrical wiring, installation of pipes and steel areas, has been successfully applied to a number of major projects distinguished reputation in their respective areas. The buckle codes applied to the total fixed flange duct connection. Deduction codes, duct buckle codes, Shanghai deduction codes, Shanghai duct hook code, deduction code, code of duct buckle Shanghai deduction codes, duct hook code