De Bothezat helicopter
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The de Bothezat helicopter, also known as the Jerome-de Bothezat Flying Octopus, was an experimental quadrotor helicopter built for the United States Army Air Service by George de Bothezat in the earl
De Bothezat Quadrotor
Breguet-Richet Gyroplane
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The Breguet-Richet Gyroplane was an early French experimental quadcopter rotary-wing aircraft developed by Breguet Aviation.
De Bothezat helicopter
…Bréguet-Dorand Gyroplane Laboratoire Bréguet-Richet Gyroplane Cornu helicopter…
Model of the Bréguet-Richet Gyroplane No.1.