Dau Tu Va Phat Trien Nha Tan Son Thanh Joint Stock Company Address: Lot NLK 05-1, N16 Urban Area, Cao Loc Town, Cao Loc District, Lang Son Province Enterprise code: 4900257037 Phone: 02053878501 Representative: Nguyen Tien Hung Adress: No 250, Civil Group 20, Phuong Lien Ward, Dong Da District, Ha Noi City Cao Loc Town, Cao Loc District, Lang Son ProvinceFounding date: 12 - 6 - 2007