An electronic data processing card with an opening that contains one frame of microfilm This frame is usually cut from a roll of microfilm. Characteristics of aperture cards are specified in several standards including Unitized Microfilm Carriers (Ap

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1. An electronic data processing card with an opening that contains one frame of microfilm This frame is usually cut from a roll of microfilm. Characteristics of aperture cards are specified in several standards including Unitized Microfilm Carriers (Ap