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Beijing Friend: No. 7, Xingguang Fifth Street, Optical and Electromechanical Integration Industrial Base, Tongzhou District, Beijing
Hebei Friend: No. 19, Hengwang Avenue, Central Section of Economic Development Zone, Qianxi County, Hebei Province
Jiangsu Friend: No. 70, Demin Road, Zhangpu Town, Kunshan City, Jiangsu Province