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Aperture card: An aperture card is a type of punched card with a cut-out window into which a chip of microfilm is mounted. Such a card is used for archiving or for making multiple inexpensive copies of a document for ease of distribution. The card is typically punched with machine-readable metadata associated with the microfilm image, and printed across the top of the card for visual identification. The microfilm chip is most commonly 35mm in height, and contains an optically reduced image, usually of some type of reference document, such as an engineering drawing, that is the focus of the archiving process. Aperture cards have several advantages and disadvantages when compared to digital systems. Machinery exists to automatically store, retrieve, sort, duplicate, create, and digitize cards with a high level of automation. While many aperture cards still play an important role in archiving, their role is gradually being replaced by digital systems.
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Computer science, Database management by Cram101 Textbook Reviews
Aperture card: An aperture card is a type of punched card with a cutout window into which a chip of microfilm is mounted. Such a card is used for archiving or for making multiple inexpensive copies ofadocument for ease of distribution.
Kaula Festschrift : Papers Contributed in Honour of Prof. P.N. Kaula on His Sixty-first Birthday by Velaga Venkatappaiah
Aperture card with pouches for 35 or 16 mm: The aperture card is a data processing 80 column punched card containing one or ...
by John Millar Carroll
An aperture card is a punched card with an insert of microfilm. The keypunched portion contains information for sorting and identification. In this case, the microfilm insert is a photograph of the member's original application for credit. It shows: ...
A Guide to the Language of Engineering by Ronald E. Hanifan
Aperture Card An unprocessed tabulating card that contains an aperture ( rectangular hole) specifically designed for the subsequent insertion of a developed frame of silver halide camera microfilm. Aperture, Clear (CA) The opening in the ...
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