Number | Name | Date | Kind |
---|---|---|---|
3344235 | Green et al. | Sep 1967 | |
3517139 | Whitney | Jun 1970 | |
3889068 | Dellecker | Jun 1975 | |
3936613 | Nishigori et al. | Feb 1976 | |
3956595 | Sobanski | May 1976 | |
4582956 | Doughty | Apr 1986 | |
4661975 | Brecher | Apr 1987 | |
4802206 | Yoshida et al. | Jan 1989 | |
4809321 | Morganstein et al. | Feb 1989 |
Number | Date | Country |
---|---|---|
62-26963 | Feb 1987 | JPX |
Entry |
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"Bellcore Teaches Some Manners to Call Waiting", Telephony, Aug. 24, 1987, pp. 15, 16. |
"Business and Residence Features", Switching Products 5ESS.RTM. Switch Feature Handbook, 235-390-500, 1986, pp. 14, 15. |
Bell Laboratories Station User's Guide for the AT&T Dimension.RTM. PBX, Jun. 1982. |
Nippon Denki K.K., "Additional Dial Call Waiting System", vol. 9, No. 165 (E-327) (1888), Jul. 10, 1985. |