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Marquis Raul Pateras Pescara Experimental Prototype Coax?Marquis Raul Pateras Pescara Experimental Prototype Coaxial Helicopter Barcelona December 1930 Flying Date: 1930
Pescara Helicopter 1922Argentinian designer Marchese Raul Pateras de Pescara builds several helicopters 1919 to 1924, tested in France : this 1922 model has four rotors to provide vertical lift