Ky Thuat Va Thuong Mai Hoang Son LTD Address: No 43, Lane 477, Nguyen Trai, Thanh Xuan District, Ha Noi City Enterprise code: 0104153459 Phone: 02462912345 Representative: Ngo Cao Son Adress: Khu Tap The Truong Dai Hoc Thuy Loi, Dong Da District, Ha Noi City Thanh Xuan District, Ha Noi CityFounding date: 10 - 9 - 2009