What happens when you mail a letter

What happens when you mail a letter

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Back in the day post offices (in NYC) were connected with pneumatic tubes, Popular Science 1951 – Link.

2 thoughts on “What happens when you mail a letter

  1. RussNelson says:

    Some of the tubes are still contiguous. Somebody was making noises about running fiber through them.

  2. iNap says:

    It’s an Internet of tubes, if you will.

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