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

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

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High-altitude balloon and method and apparatus for making it

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

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Hot air aerostat

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

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Hot air balloon amusement ride

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

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Hot air balloon and methods and devices for augmenting buoyancy,

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

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Hot air rescue balloon

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

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Hot air rescue balloon

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

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Hot gas device

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

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