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A technical drawing and correspondence regarding an attempt to patent a flying bicycle, Germany, 1897–1913 Technical drawing in white ink on blue cardboard showing four views of a bicycle with a rear propeller and swiveling wings. Also included is a negative imperial patent decision from 1897, as well as later correspondence between the inventor and a patent engineering firm in Leipzig. Curious! Dimensions of the drawing: 32.5 x 41.5 cm. Condition: II
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