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spherical free balloon
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Annex 7 to the Convention on International Civil Aviation. Aircraft nationality and registration marks. 6th ed. Montreal: ICAO, 2012.
- Related Term
- balloon
- captive balloon
- captive gas balloon
- free balloon
- non-spherical captive balloon
- Português
- balão livre esférico