Number | Date | Country | Kind |
---|---|---|---|
8204856 | Dec 1982 | NLX |
Number | Name | Date | Kind |
---|---|---|---|
3441921 | Jacoby | Apr 1969 | |
3892916 | Boulter | Jul 1975 | |
4123710 | Stuart et al. | Oct 1978 | |
4142065 | Tannhauser | Feb 1979 | |
4313203 | van Gerwen et al. | Jan 1982 | |
4317212 | van Gerwen et al. | Feb 1982 |
Entry |
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"Differentiate", Data Communications Dictionary, Charles J. Sippl, van Nostrand Reinhold Co., 1976. |