Lien Doan Lao Dong Huyen Address: TK Hoang Van Thu, Bac Son Town, Bac Son District, Lang Son Province Enterprise code: 4900358194 Phone: 02053837482 Adress: Bac Son District, Lang Son Province Bac Son Town, Bac Son District, Lang Son ProvinceFounding date: 31 - 7 - 2009