A Brief History of the Marque
Manufactured in Tuttlingen by Eberwein & Diener Motorenbau GmbH, 1925-1927
Christian Diener became acquainted with BMW designer Eberwein, who had developed a new kind of engine, and together they produced motorcycles. Motorcycle production ceased in 1927, but the company survives to this day as a producer of surgical instruments.
Sources: nl.wikipedia.org, diener-gmbh.de
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