In the 1800s cities used pneumatic tubes to transfer physical documents. Of course with the internet we no longer need these long tunnels, but that doesn't mean that they aren't fun to learn about how... continue reading
posted by winkler1 1 decade 5 years 5 months 2 weeks ago • 1,055 viewsOf historical value
Created: 1 decade 5 years 8 months ago
Updated: 8 years 5 months ago
Views: 2,248
Updated: 8 years 5 months ago
Views: 2,248