Dau Tu Xay Dung Thanh An Lang Son Joint Stock Company Address: No 8a/1, To Son Street, Khoi Van Mieu, Chi Lang Ward, Lang Son City, Lang Son Province Enterprise code: 4900822754 Phone: 0949054568 Representative: Luong Van Thuan Chi Lang Ward, Lang Son City, Lang Son ProvinceFounding date: 29 - 3 - 2018