Building underground tunnels for 30 second delivery times(share.transistor.fm)3 points·by Mat_Sherman·6년 전·1 commentsshare.transistor.fmBuilding underground tunnels for 30 second delivery timeshttps://share.transistor.fm/s/feaa771d1 commentsPost comment[–]pwg·6년 전replyWhat was old is new again:> Pneumatic tube mail in New York City> https://en.wikipedia.org/wiki/Pneumatic_tube_mail_in_New_Yor...> The pneumatic tube mail was a postal system operating in New York City from 1897 to 1953 using pneumatic tubes
> Pneumatic tube mail in New York City
> https://en.wikipedia.org/wiki/Pneumatic_tube_mail_in_New_Yor...
> The pneumatic tube mail was a postal system operating in New York City from 1897 to 1953 using pneumatic tubes