What material was the frame of Karl Drais's 1817 'running machine' primarily made of?
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Karl Drais crafted his revolutionary two-wheeler, the Laufmaschine, almost entirely out of wood to keep it lightweight. It lacked pedals, meaning riders had to push themselves along with their feet. Interestingly, Drais invented it partly because a volcanic eruption caused crop failures, leading to a shortage of horses. Photo: Gun Powder Ma, Wikimedia Commons, CC BY-SA 3.0.
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Source: Wikipedia (CC BY-SA)
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