Dien Tu Vien Thong Bac A Joint Stock Company Address: No 234, Le Trong Tan Street, Khuong Mai Ward, Thanh Xuan District, Ha Noi City Enterprise code: 0101547712 Phone: 0245656356 Representative: Dao Van Tan Adress: No 6B, Lan Ba Lane, Trung Phung Ward, Dong Da District, Ha Noi City Khuong Mai Ward, Thanh Xuan District, Ha Noi CityFounding date: 27 - 10 - 2004