Some of the first models of the autogiro, the predecessor of helicopters, designed by Juan de la Cierva. Its first succesful flight was a 183 m "jump" achieved in 1923 in Getafe,
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Autogyro - Wikipedia
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Autogyro - Wikipedia
Autogiro Company of America AC-35 - Wikiwand
File:Autogyro at Farnborough, 1925 (Our Generation, 1938).jpg - Wikimedia Commons