Address：Room No.511, Oriental International Building C, No.152, North of Jianshe Road, Hi-tech Industrial Development Zone, Tangshan city, Hebei province。

TEL:0315-3179549　　 FAX:0315-3195748

Research and Development Center：Room No.410 of the Innovation Building, North of Xichang Road, Hi-tech Industrial Development Zone, Tangshan city, Hebei province.

TEL/FAX: 0315-3205798
Web：www.otsk.cn 　 E-mail:otsk@163.com
Domestic business:Wang Shouping13582519909
International business:Wang Xiangyu18631540014