Cong Nghe Va Thuong Mai Sigma Viet Nam Joint Stock Company Address: Dinh Hamlet, Tri Phuong Commune, Tien Du District, Bac Ninh Province Enterprise code: 2300661452 Phone: 0986434402 Representative: Phan Van Tan Tri Phuong Commune, Tien Du District, Bac Ninh ProvinceFounding date: 19 - 7 - 2011