Cty TNHH Thuong Mai Ky Thuat Son Khoi Address: 28, Tran Phu Street, Hoang Van Thu Ward, Lang Son City, Lang Son Province Enterprise code: 4900254050 Phone: 0205876845 Representative: Nguyen Van Son Adress: No 28, Tran Phu Street, Hoang Van Thu, Lang Son City, Lang Son Province Hoang Van Thu Ward, Lang Son City, Lang Son ProvinceFounding date: 5 - 4 - 2007