Pneumatic tube messaging system.
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Previously:
https://www.homemadetools.net/forum/...497#post147104
https://www.homemadetools.net/forum/...392#post161918
https://www.homemadetools.net/forum/...676#post174574
https://www.homemadetools.net/forum/...781#post133201
https://www.homemadetools.net/forum/...187#post130481
