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It also reduced the number of errors, by having a standardised form of numbers on the sales slip, instead of various kind of handwriting style.
Credit cards have a magnetic stripe conforming to the ISO/IEC 7813.
This sometimes led to a case of mistaken identity, either accidentally or intentionally, by acting on behalf of the charge account owner or out of malice to defraud both the charge account owner and the merchant.
Beginning in the 1930s, merchants started to move from charge coins to the newer Charga-Plate. It was a 2½" × 1¼" rectangle of sheet metal related to Addressograph and military dog tag systems.
Many modern credit cards have a computer chip embedded in them as a security feature.
In addition to the main credit card number, credit cards also carry issue and expiration dates (given to the nearest month), as well as extra codes such as issue numbers and security codes.
In 1934, American Airlines and the Air Transport Association simplified the process even more with the advent of the Air Travel Card.