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õhust kergem jõuseadmeta ja mehitamata vabalt lendav õhusõiduk, a non-power-driven, unmanned, lighter-than-air aircraft in free flight
unmanned free balloon . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/unmanned%20free%20balloon/1/eng (01.08.2026)