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grozzle , 3 months ago IBM standard cards are one 48th of a barleycorn thick. I believe IBM measured from the 1932 Iowa Reference Barleycorn, now kept in the vault inside Mt Rushmore.
IBM standard cards are one 48th of a barleycorn thick. I believe IBM measured from the 1932 Iowa Reference Barleycorn, now kept in the vault inside Mt Rushmore.