Du Duyen Address: Tieu Khu Vinh Thuan, Bac Son Town, Bac Son District, Lang Son Province Enterprise code: 4900650992 Phone: 02053837796 Representative: Nguyen Trong Du Adress: Tieu Khu Vinh Thuan, Bac Son Town, Bac Son District, Lang Son Province Bac Son Town, Bac Son District, Lang Son ProvinceFounding date: 21 - 4 - 2011