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Dr. F. Krantz
Rheinisches Mineralien-Kontor GmbH & Co. KG
Fraunhoferstraße 7
53121 Bonn
Phone Number:  +49 (0) 228 / 988 65-0
Fax Number (also for orders):  +49 (0) 228 / 988 65-20
E-Mail: info@krantz-online.de
Orders to: bestellung@krantz-online.de