Manufactured by Manuel Mahn, Maschinenfabrik & Gießerei, Vienna 1904-1905, this was the brainchild of Felix Karmeli. Mahn owned a foundry which made the delta metal (brass alloy) castings, and the patents were in his name.
The two-speed 3½ h.p. parallel-twin was mounted adjacent to the rear wheel, and the machine could reportedly achieve 80 km/h. Its last appearance was at the 1905 Vienna Auto Show.
Sources: GTU Oldtimerservice, et al.
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