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Kellett KD-1
Kellett Autogiro Company · Autogyro · United States · Interwar (1919–1938)
The Kellett KD-1 is a 1930s American autogyro built by the Kellett Autogiro Company. It had the distinction of being the first practical rotary-wing aircraft used by the United States Army and inaugurated the first scheduled air-mail service using a rotary-wing aircraft.