A Brief History of the Marque
Ducommun machines were manufactured in Mulhouse which was at the time an independent French state surrounded by German-controlled Alsace. The location of the factory is believed to have been " between le Faubourg de Colmar et la place Franklin" but the only similar address appears to be in nearby Cernay.
The company filed a patent in Switzerland for the machine which closely resembled the much later Velosolex.Sources: moto-histo.com, JLBweb.
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