Lien Doanh Che Bien Khoang San Lang Son Address: Keo Hamlet, Tan My Commune, Van Lang District, Lang Son Province Enterprise code: 4900231085 Phone: 02053711109 Representative: Tang Bao Sheng Adress: Ban Keo Hamlet, Tan My Commune, Van Lang District, Lang Son Province Tan My Commune, Van Lang District, Lang Son ProvinceFounding date: 15 - 6 - 2005