3
Pneumatic tubes were used to deliver mail!
(slrpnk.net)
You can read more about the fascinating history here: https://about.usps.com/who-we-are/postal-history/pneumatic-tubes.pdf
Credit: https://hachyderm.io/@miah
What about this is "punk"? It's just old technology. I don't see a reason to give everything a "punk" label.