It sounds (and looks) like something from a steampunk sci-fi novel but the Pražská potrubní pošta (Prague Pneumatic Post), a 55-kilometer-long network of underground air-powered delivery tubes, really exists.
It sounds (and looks) like something from a steampunk sci-fi novel but the Pražská potrubní pošta (Prague Pneumatic Post), a 55-kilometer-long network of underground air-powered delivery tubes, really exists.
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