free balloons

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  4. Furnishings and Equipment (hierarchy name)
  5. Transportation Vehicles (hierarchy name)
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  7. air and space transportation vehicles
  8. aircraft
  9. [aircraft by form]
  10. lighter than air aircraft
  11. balloons (aircraft)
  12. free balloons
Scope note
Lighter-than-air aircraft that can be made to ascend by the use of ballast and to descend by the release of gas but which cannot be guided in flight.
free balloons
Accepted term: 13-May-2025