[TUHS] Remember the ed thread?

[M Douglas McIlroy]

> the hammer fired to make an impression the ribbon on the paper, which was
> caused the noise people associated with computer printers.

GE outdid the printer with a fantastically fast pneumatic card reader. The make
and break of the suction on each card repeated at aural frequency and so loud
that I hied off to the instrument stockroom to borrow a noise meter. It was 90db
at the operator's position.