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    Address: Room No.510-511 Oriental building C, No.152 North Jianshe Road, High-tech development zone, Tangshan city, Hebei province, China (063020)
    Tel:+86-315-3179549  Fax:+86-315-3195748  Website:www.otsk.cn  Email:otsk@163.com  Contact:Mr Wang +86-18631540014