Manual of the Pneumatic Mail Mystem for the TB-3
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PETERTHEEATER
Airman
That's different! What was the purpose. To pass written messages between crewmember stations?
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![](data:image/svg+xml;charset=utf-8,<svg height="16px" width="16px" xmlns="http://www.w3.org/2000/svg" version="1.1"/>)
