Thuong Mai Va Ky Thuat Sigma LTD Address: No 23, Lane 245, Alley 120, Dinh Cong Street, Dinh Cong Ward, Hoang Mai District, Ha Noi City Enterprise code: 0109543798 Phone: 0983109615 Representative: Ly Thi Tu Uyen Dinh Cong Ward, Hoang Mai District, Ha Noi CityFounding date: 9 - 3 - 2021