Number | Date | Country | Kind |
---|---|---|---|
2706080 | Feb 1977 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3662341 | Baumgartner et al. | May 1972 | |
3715724 | DeMonte et al. | Feb 1973 | |
3805239 | Watanabe | Apr 1974 | |
3921135 | Komaru et al. | Nov 1975 | |
3935562 | Stephens | Jan 1976 | |
3973239 | Kakumoto et al. | Aug 1976 | |
4075604 | DeGasperi | Feb 1978 |
Entry |
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Dorr et al., "Adaptive Thresholding for a Mark Reading System", IBM Tech. Disclosure Bulletin, vol. 15, No. 8, Jan. 1973, pp. 2597-2598. |