Phat Trien Do Thi Ben Bac Joint Stock Company Address: No 77, Ben Bac Street, Tam Thanh Ward, Lang Son City, Lang Son Province Enterprise code: 4900660165 Phone: 02053500888 Representative: Mai Tien Dung Adress: No 42, Tran Phu Street, Hoang Van Thu Ward, Lang Son City, Lang Son Province Tam Thanh Ward, Lang Son City, Lang Son ProvinceFounding date: 16 - 6 - 2011