16-Digit Credit Card Numbers       

Open Source and Standards Accomplishment | 1954

IBM researcher: Hans-Peter Luhn

Where the work was done: IBM T.J. Watson Research Center

What we accomplished: The worldwide standard for 16-digit credit card numbers and the basis of ISO/TEC 7812-1 (Hans-Peter Luhn, pictured).

Related links: Hans-Peter Luhn (ASIS&T)

Image credit: ASIS&T

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