| 摘要 |
A self contained system for both imprinting the information present on a credit card and determining if that credit card has been invalidated for any of several reasons is disclosed. The system serially senses the multi-digit credit card number while the imprinting is taking place and transmits this number to a scratch pad memory. This number is then compared serially to a list of invalid credit card numbers and if a match takes place, an indicator is energized to indicate invalidity of the card.
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