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Back in the 19th century, pneumatic tubes were brand-new and all the rage. Department stores, banks, even cities were linked via vacuum-driven post systems. These networks transported documents or money in capsules travelling through tubes of compressed air winding up and down and around all sorts of buildings. But by the late 20th century, such systems had become increasingly rare, made nearly obsolete by modern technology such as email.

However, the past 10 years has seen a renaissance in pneumatic tube technology. This is in part due to the…

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