Xay Dung Tong Hop Bac Son Joint Stock Company Address: No 36, To Vinh Dien Street, Khuong Trung Ward, Thanh Xuan District, Ha Noi City Enterprise code: 0104059495 Phone: 02435592330 Representative: Nguyen Manh Ha Adress: Cua Ong Hamlet, Son Binh Commune, Huong Son District, Ha Tinh Province Khuong Trung Ward, Thanh Xuan District, Ha Noi CityFounding date: 20 - 7 - 2009