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The generic term used to be "hush covers," if I remember correctly. The printers of the day could be pretty noisy blighters.

I had a college job as Computer Operator for a University where they had Band Printers.

NOISY as F**, screaming with a metal ribbon containing character-shapes being hammered by a 132-head (yes) static print-head.

Could print a page every second or two - and could feed paper quickly across blank regions.

Those things were the size of modern trans cans (with the folding lids). And they were insulated for sound.