Not sure if you're being sarcastic (the person you're replying to definitely is), but pneumatic tubes [0] have been around since the 19th century. [0] https://

Not sure if you're being sarcastic (the person you're replying to definitely is), but pneumatic tubes [0] have been around since the 19th century. [0] https://en.wikipedia.org/wiki/Pneumatic_tube https://en.wikipedia.org/wiki/Pneumatic_tube