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Значения термина free balloons на английском

Значения для термина "free balloons" отсутствуют.
Использование термина free balloons на английском
1
Some, at least, of the methods formerly recommended for the management of free balloons must in these days be modified.
The Dominion of the Air: The Story of Aerial Navigation
2
The Siege of Paris showed the utility of free balloons, and occasions arise when their use might be still further extended.
The Dominion of the Air: The Story of Aerial Navigation
3
Since planes could not report the progress of the snowshoers over the grass, dirigibles and free balloons drifting with the wind gave minutetominute reports.
Greener Than You Think
4
Distinct from, and supplementing, the records obtained by free balloons, manned or unmanned, are those to be gathered from an aerostat moored to earth.
The Dominion of the Air: The Story of Aerial Navigation
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