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ANSI/INCITS 21
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ANSI/INCITS 21 1967 Edition, January 1, 2017 Rectangular Holes in Twelve-Row Punched Cards
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Description / Abstract:
This standard specifies the size and location of rectangular holes in twelve-row 3%-inch wide punched cards. To be a processable document, suitable for information interchange. cards must also meet USA Standard Specifications for General Purpose Paper Cards for Information Processing, X3.11-1966.