4. Aeronautics and astronautics
  5. Aircraft, heavier-than-air
  6. Helicopter or auto-rotating wing sustained, i.e., gyroplanes

Frederick W. Piasecki

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Rotary wing aircraft shrouded propeller sidewall thruster

Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent

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Vectored thruster augmented aircraft

Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Reexamination Certificate

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Wind turbine

Prime-mover dynamo plants – Electric control – Fluid-current motors
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1579443

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