Number | Name | Date | Kind |
---|---|---|---|
1603592 | Glasner | Oct 1926 | |
3409347 | Vogel | Nov 1968 | |
3412493 | French | Nov 1968 | |
3694240 | Miller et al. | Sep 1972 | |
3781113 | Thomas | Dec 1973 |
Entry |
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Schuenzel & Moore, "Credit Card System," IBM Technical Disclosure Bulletin, vol. 13, No. 1, Jun. 1970. |