aperture card

2023.10.27 最終更新日時 : 2023.10.27 jiima_admin

This is a microform consisting of a roll of film cut into one or several pieces and attached to an aperture portion of an information exchange paper card (IBM punched card: dimensions 187.32 x 82.55 mm) with the aperture (rectangular window for holding micro-images), or a microform in which the aperture portion is kept as a transparent bag and micro-images are inserted into the aperture.

They are mainly used for the management of drawings.

Aperture Card

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