The best you can do, is to contact with Klein, Prof. Dr. U. E., Postfach 11 53, 57234 Wilnsdorf,
Am Stoss 36, 57234 Wilnsdorf, Tel. 0271 390256, Fax 0271 394476, E-Mail marret-udo.klein@gmx.de
There are a lot of forgeries in the market, so be carefull
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