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Add:Wangge Village,Longkou City,Shandong Province,China 

International Business Department ：
Mb: 13665450266
Tel: 0086-535-8863329   8863466
Fax:0086-535-8863328 
Email: sales@sd-yd.com  hank.sun@sd-yd.com

Domestic Business Department :
Tel: 0086-535-8881272 
Fax:0086-535-8881238 
Email: xslv@sd-yd.cn 

Personnel Department
Tel: 0086-535-8863324
Email:qiguan@sd-yd.com