Aperture Cards are a marriage of old-style IBM punch cards and microfilm. A cutout aperture area on the card contains a 35mm microfilm image of a document, typically a blueprint or other engineering drawing.
Information about the drawing (such as the title, version, page, etc) can be punched into the card (in what is called Hollerith code) and printed along the top. An aperture card scanner reads the punch data and scans the microfilm window. The result is a digital image similar to what is produced from a paper scanner. The punched textual information is often used to automatically index the scanned image, allowing unattended batch input of thousands of cards at a time.
We can take your old aperature cards and read these providing you with a digital file of the contents giving you access to view and print your documents.