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Duisburg Knigstrae about . Knigstrae in Duisburg mit elektrischer Straenbahn der Linie um Historische Ansichtskarte Knigstrae at Duisburg with electric tram about Historical postcard zeno org Contumax GmbH Co KG Author PDold Postcards of Duisburg Trams in Duisburg Knigstrae Duisburg Images from zeno org