Number | Name | Date | Kind |
---|---|---|---|
4405833 | Cave et al. | Sep 1983 | |
4439639 | Munter | Mar 1984 | |
4686699 | Wilkie | Aug 1987 | |
4924493 | Dang et al. | May 1990 |
Entry |
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Signetics Linear Products, "NE5900 Call Progress Decoder Product Specification", May 8, 1986, pp. 6-3 to 6-9. |