4. Aeronautics and astronautics
  5. Aircraft, lighter-than-air
  6. Balloons
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Permanently buoyant balloon

Aeronautics and astronautics – Aircraft – lighter-than-air – Balloons
Patent

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Personnel lift device and amusement use thereof

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

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Personnel lift device with automatic ascent and descent control

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

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Power generation, transmission, and distribution system for...

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

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Pressure-resistant balloon

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

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Process and apparatus for exploring the atmosphere of a planet

Aeronautics and astronautics – Aircraft – lighter-than-air – Balloons
Patent

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Process and apparatus for hooking a band of a flexible material

Aeronautics and astronautics – Aircraft – lighter-than-air – Balloons
Patent

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