Editing Punched card (section)

==Standards==
[[File:Census pantograph and 1930s keypunches.jpg|thumb|A U.S. Census Bureau clerk (left) prepares punch cards using a pantograph similar to that developed by Herman Hollerith for the 1890 Census, while a second clerk (right) uses a 1930s key punch to perform the same task more quickly.]]
[[File:Early US Census Machines 1954 08004.jpg|thumb|A wall-sized display sample of a punch card for the 1954 U.S. Census of Agriculture]]

* ANSI INCITS 21-1967 (R2002), ''Rectangular Holes in Twelve-Row Punched Cards'' (formerly ANSI X3.21-1967 (R1997)) Specifies the size and location of rectangular holes in twelve-row {{convert|3+1/4|in|mm|adj=mid|-wide}} punched cards.
* ANSI X3.11-1990 ''American National Standard Specifications for General Purpose Paper Cards for Information Processing''
* ANSI X3.26-1980 (R1991) ''Hollerith Punched Card Code''
* ISO 1681:1973 ''Information processing – Unpunched paper cards – Specification''
* ISO 6586:1980 ''Data processing – Implementation of the ISO 7- bit and 8- bit coded character sets on punched cards''. Defines ISO 7-bit and 8-bit character sets on punched cards as well as the representation of 7-bit and 8-bit combinations on 12-row punched cards. Derived from, and compatible with, the Hollerith Code, ensuring compatibility with existing punched card files.