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

William Townsend

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Electrical computers and digital processing systems: multicomput – Computer network managing
Reexamination Certificate

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Energy absorbing airframe for a vertical lift vehicle

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

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