2004-10-30/2020-04-09 - From the OHS PC Database. Apprenticed with Victor Gonzales, Chatillon sous Bagneaux, France. With Frobenius 1931-. Sources: Beckerath.com http://www.beckerath.com/index.php?option=com_content&view=article&id=4&Itemid=106&lang=en, Accessed December 18, 2016.
2018-05-07/2020-04-09 - From the OHS Database Builders Listing editor, December 18, 2016. — Established his own firm in 1949, Hamburg, Germany. Died in 1976, firm continued by his widow and three employees since that date. Source:
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