Thuong Mai Toan Thang Address: No 71, Tieu Khu Tran Phu, Bac Son Town, Bac Son District, Lang Son Province Enterprise code: 4900531850 Phone: 02053837183 Representative: Trinh Ngoc Thang Adress: No 71, Tieu Khu Tran Phu, Bac Son Town, Bac Son District, Lang Son Province Bac Son Town, Bac Son District, Lang Son ProvinceFounding date: 27 - 4 - 2010