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Head office: 　　Suite 512, Commercial building B, 　　No. 19, Dahuisi Road, Haidian District, Beijing, China 100081 　　　　Phone: 0086-10-62170771 MP:13801275483 　　　　Facsimile: 0086-10-62170771 　　　　E-mail: bjmds@bjmds.com Sales: 　　　　Phone: 0086-10-62170771 MP:13801275483 　　　　Facsimile: 0086-10-62170771 　　　　E-mail: sales@bjmds.com Research laboratory: 　　Research Building, No. 5, Dajiaoting, Chaoyang District, Beijing Production Workshop: 　　No. 16, Industrial development zone, weishanzhuang, Daxing District, Beijing Homepage: 　　Http://www.BJMDS.com