Edge-notched card
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Edge-notched cards or edge-punched cards are a system used to store a small amount of binary or logical data on paper index cards, encoded via the presence or absence of notches in the edges of the ca
Edge-notched card used as a library card. Edges not notched here.
McBee Keysort card (1932 – 1980s): front and rear, with instructional diagram on rear
Hand tool for notching cards.
Keysort cards used in World War II codebreaking
Punched card sorter
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A punched card sorter is a machine for sorting decks of punched cards.
Edge-notched card
…one corner of each card was beveled, much like Hollerith punched cards. Edge-notched cards, however, were not intended to be read by machines such as IBM card sorters. Instead, cards were manipulated by passing one or more slim needles through selected holes in a group of cards. While the rest of the deck would be…
IBM 080 Card Sorter
IBM 082 Card Sorter
Reader brush on an IBM 83 card sorter
Replica of Hollerith tabulating machine with sorting box, circa 1890. The "sorting box" was an adjunct to, and controlled by, the tabulator. The "sorter", an independent machine, was a later development.