3 ms·
There used to be pneumatic (compressed air) tubes for mail, but it became kind of irrelevant when fax and email obviated the need to send small letters.
by bobthepanda 4y ago
There used to be pneumatic (compressed air) tubes for mail, but it became kind of irrelevant when fax and email obviated the need to send small letters.
- semi-extrinsic 4y agoThey're still popular in hospitals AFAIK, where they are useful for sending e.g. blood samples and medicines around.