DieDU Manufacturing Co. Ltd. war ein britischer Automobilhersteller inClapham, London. Nur 1914 wurde dort ein Leichtfahrzeug unter dem NamenD Ultra gebaut.
Der Wagen wurde ausschließlich aus Komponenten anderer Hersteller montiert. Weiteres ist über das Fahrzeug nicht bekannt.
Er erschien zum denkbar ungünstigsten Zeitpunkt, zu Beginn desErsten Weltkrieges. Nach dem Krieg lebte die Produktion nicht wieder auf.
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