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Today In Aviation History: First Flight of the Cornu Helicopter

On November 13, 1907, Paul Cornu's experimental helicopter made aviation history with the first free rotary-wing flight.
insider.si.edu

History of the helicopter : as told by its pioneers, 1907-1956 / Jean Boulet ; translated by Claude Dawson

First attempts (1907-1922) -- Early searching (1922-1934) -- Take-off (1935-1945) -- Post World War II -- Jet-tip helicopters -- Status of the helicopter industry in 1956 -- Utilization of helicopters ...