@dfb2c35d @1da41359
Everyone who used punch cards, I think, knew this one. Usually done with a big Marks-A-Lot, in red, or maybe black.
@ec3be15c @lauren@laurenweinstein.org I have a couple of old punched cards of my Dad's. I should see if they have marks on the edge.
@dfb2c35d
I remember in 1984 we could check the order of the Hugo card packet by the color striping - each of the three cards had a different header stripe.
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