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Company: oil drilling bits Contact: Ms. Crystal Lee Address: Room 0221, building 11, No.1 yard, Wu li qiao second street, Chaoyang District, Beijing, China Postcode: 100024 Tel: 86-10-57290815 Fax: 86-10-59694931 Homepage: http://www.bjleeding.com/ http://drillingbits.86exporter.com E-mail: