balloon mail (0 synonym found)

We don't have any synonyms for balloon mail yet.

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balloon sail

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Definition of balloon mail:

(n) : (postal, philately) The transport of mail, usually for weight reasons, in the form of a postcard carrying the name of the sender by means of an unguided hydrogen or helium balloon.
Definition of balloon mail:

(n) : (postal, philately) The transport of mail, usually for weight reasons, in the form of a postcard carrying the name of the sender by means of an unguided hydrogen or helium balloon.
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