Number | Name | Date | Kind |
---|---|---|---|
3936609 | Waldeck | Feb 1976 | |
3961139 | Bowman et al. | Jun 1976 | |
4546470 | Naylor et al. | Oct 1985 | |
4549303 | Gutleber | Oct 1985 | |
4638476 | Acampora et al. | Jan 1987 | |
4675863 | Paneth et al. | Jun 1987 | |
4713809 | Mizota | Dec 1987 | |
4825460 | Carter et al. | Apr 1989 |
Entry |
---|
Digital Telephony--John Bellamy, 1982, pp. 417-418. |