High Quality Content by WIKIPEDIA articles! The tub file was an early random access memory technology in which pre-punched punched cards that contained frequently used information were stored in a file for reuse. Usually such tub files would contain a series of related data — one for each item sold in a store, for example — so that data would be easy to find and reuse. A punched card (or punch card or Hollerith card or IBM card) is a piece of stiff paper that contains digital information represented by the presence or absence of holes in predefined positions.

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