"D-Rad was a motorcycle factory in Berlin (Spandau), Germany. The factory was founded as Star, but in 1923 Deutsche Industrie-Werke took it over and changed the name to D-Rad. NSU merged with Deutsche Industrie-Werke in 1932 and terminated D-Rad production in 1933." - (en.wikipedia.org 29.01.2020)
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