Thuong Mai Dich Vu Ky Thuat Ha Tang Sigma Global Joint Stock Company Address: No 99, Hamlet 10, Hau Duong Hamlet, Kim Chung Commune, Dong Anh District, Ha Noi City Enterprise code: 0105579835 Phone: 02439518710 Representative: Tran Manh Tuan Adress: Hau Duong Hamlet, Kim Chung Commune, Dong Anh District, Ha Noi City Kim Chung Commune, Dong Anh District, Ha Noi CityFounding date: 19 - 10 - 2011