definition

 

 

Card with one or more rectangular opening(s), or aperture(s), specifically prepared for the mounting or insertion of a piece of photographic film containing one or more microimage(s). The cards are usually EAM (Electrical Accounting Machine) punched cards, commonly known as IBM cards, that are standardized for use in card-handling machines. Such cards contain only one aperture and most frequently have only one microimage.

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