O To Son Tin Joint Stock Company Address: No 321, Pham Van Dong Street, Xuan Dinh Ward, Bac Tu Liem District, Ha Noi City Enterprise code: 0109778165 Phone: 0931518888 Representative: Phan Hoang Son Xuan Dinh Ward, Bac Tu Liem District, Ha Noi CityFounding date: 14 - 10 - 2021