4. Aeronautics and astronautics
  5. Aircraft, lighter-than-air
  6. Airships

David B. Eichstedt

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Pressure stabilized gasbag for a partially buoyant vehicle

Aeronautics and astronautics – Aircraft – lighter-than-air – Airships
Reexamination Certificate

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Propulsion system for a semi-buoyant vehicle with an...

Aeronautics and astronautics – Aircraft – lighter-than-air – Airships
Reexamination Certificate

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Semi-buoyant vehicle with aerodynamic lift capability

Aeronautics and astronautics – Aircraft – heavier-than-air – Airplanes – weight diminished by bouyant gas
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2018464

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