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This is a US Navy free balloon as used for initial lighter-than-air training during the | This is a US Navy free balloon as used for initial lighter-than-air training during the 1920s to 1940ies. It is fairly representative for a type of aircraft that first flew in 1783 and soon afterwards found a shape and construction that it retained (almost) to this day. | ||
==Handling instructions== | ==Handling instructions== |
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