Son Duong Joint Stock Company Address: Keo Khoac Hamlet, Yen Trach Commune, Cao Loc District, Lang Son Province Enterprise code: 4900289455 Phone: 0982398288 Representative: Vi Duc Son Adress: Keo Khoac Hamlet, Yen Trach Commune, Cao Loc District, Lang Son Province Yen Trach Commune, Cao Loc District, Lang Son ProvinceFounding date: 11 - 12 - 2008