This Day in History:
June 16, 1922
A hybrid aircraft – part airplane( three fixed wings) and part helicopter (twin rotor blades) designed by American inventor Emile Berliner – makes a short vertical flight.
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This Day in History:
June 16, 1922
A hybrid aircraft – part airplane( three fixed wings) and part helicopter (twin rotor blades) designed by American inventor Emile Berliner – makes a short vertical flight.