Kad tebuk: Perbezaan antara semakan
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== Pautan luar ==
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* [http://www.fourmilab.ch/documents/univac/cards.html UNIVAC Punch Card Gallery] (Shows examples of both left and right corner cuts.)
* [http://www.cardamation.com Cardamation] - a U.S. company still supplying punch-card equipment and supplies as of 2008
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