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These are the original pneumatic zoom tubes hidden beneath New York and London
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An old engraving of a pneumatic tube system for delivering small items (mail and packages) short distances around an office or factory. It is from a Victorian book of the 1880s. Pneumatic
Pneumatic tube systems for industrial use
Pneumatic tube - Wikipedia
Pneumatic Tube Systems in Hospitals
Kelly Systems Inc. Point to Point Pressure (Do it Yourself) The KEL2020"Complete" Pneumatic Tube System DIY KIT: Amazon.com: Industrial & Scientific