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circa 1925: Dr Manfred Curry standing beside his invention, the Curry-Landskiff, a man-powered vehicle which can reach speed of up to 35 miles per hour. (Photo by General Photographic Agency/Getty Images)

circa 1925:  Dr Manfred Curry standing beside his invention, the Curry-Landskiff, a man-powered vehicle which can reach speed of up to 35 miles per hour.  (Photo by General Photographic Agency/Getty Images)