CN Cong Ty Co Phan Dau Tu Va Phat Trien Xay Dung Lang Son Address: Trung Yen 6 Street, Moi Trung Yen Urban Area, Yen Hoa Ward, Cau Giay District, Ha Noi City Enterprise code: 4900213953-001 Phone: 02053871425 Representative: Lai Quoc Toan Adress: 267, Bac Son Street, Lang Son City, Lang Son Province Yen Hoa Ward, Cau Giay District, Ha Noi CityFounding date: 16 - 6 - 2003