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Graupner/SJ GmbH was bought after bankrupt by SJ later renamed to GRAUPNER CO.,Ltd (Korea)

History of the company
http://www.graupner.co.kr/history

Graupner Service Centre Deutschland UG  (EUROPE)

address :  Süd Nord Strasse 63, D-26907 Walchum, Germany

e-mail : service@graupner-service.de

https://www.graupner-service.de

Graupner Service Centre U.S.A

Control Hobbies LLC

3450 Palmer Drive Suite 4-277, Cameron Park, CA 95682

United States

Contact : https://www.controlhobbies.com/support.html

see also the international website https://www.graupner.com/