Five Things You Need to Know
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Air Tube Systems: Security Applications in the Cannabis Industry

https://www.klsecurity.com/cannabis-facility-design-and-planning.html

Sources

https://www.vox.com/2016/4/8/11389242/pneumatic-tube-history
https://www.theatlantic.com/technology/archive/2013/08/pneumatic-tubes-a-brief-history/278604/
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