Cards are a combination of old-style IBM punch cards and microfilm. A cut-out
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) is 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.
strange as this media may seem, it is actually a compact way to store hundreds
of thousands of engineering drawings that would otherwise take up warehouses full
of paper blueprints. Of course, as efficient as aperture cards may be, we believe
a purely digital form is even better.
Cards are often used to archive engineering drawings and their revisions.
Aperture Card Conversion is less costly with specialized equipment
Bar Code Software
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