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jhomedall
on Dec 21, 2017
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Repairing a 1960s-era IBM keypunch: controlled by ...
I suspect the sparse encoding was used so that punched cards were stiff enough to survive being fed through a reader.
(related:
https://en.wikipedia.org/wiki/Lace_card
)
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(related: https://en.wikipedia.org/wiki/Lace_card)