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The Hollerith Card

The Hollerith card (or punch card) is a recording medium for holding information for use by automated data processing machines.

Made of thin cardboard, the punch card represents information by the presence or absence of holes in predefined positions on the card.

In the first generation of computing, from the 1920s into the 1950s, punch cards were the primary medium for data entry, storage and processing.

Replaced by magnetic storage. Today, punch cards are long obsolete outside of a few legacy systems and specialized applications.

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