Number | Name | Date | Kind |
---|---|---|---|
4160131 | Kaul et al. | Jul 1979 | |
4203011 | Coviello | May 1980 | |
4338495 | Bloch et al. | Jul 1982 | |
4382163 | White et al. | May 1983 | |
4438432 | Hurcum | Mar 1984 | |
4441106 | Jackson | Apr 1984 | |
4453040 | Wolf et al. | Jun 1984 | |
4491693 | Sano et al. | Jan 1985 |
Entry |
---|
Griffiths et al., "A New Concept in PABX Operator's Console", Int. Conf. on Private Electronic Switching Systems, London, Eng., 4-10-78. |