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Zhengzhou Shengyu Electromechanical Equipment Co., Ltd. is a limited company integrating R D, production and sales. It mainly produces sprocket , roller chain sprocket , gear, stainless steel sprocket, non-standard sprocket and lifting chain; Spring series: compression spring, tension spring, butterfly spring, and undertake drawing customization. Since its establishment, Shengyu company has adhered to the policy of survival by quality and development by reputation, explored the market and served users, and won a good reputation in the industry. The products have been selling well all over the ...