Vat Tu Ky Thuat Va Van Tai O To Joint Stock Company Address: No 11, Lane 83, Ngoc Hoi Street, Hoang Mai District, Ha Noi City Enterprise code: 0100957628 Phone: 02438611178 Representative: Pham Van Duc Adress: No C11, Lot 18, Moi Dinh Cong Urban Area, Hoang Mai District, Ha Noi City Hoang Mai District, Ha Noi CityFounding date: 27 - 12 - 1999