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5247591 | Baran | Sep 1993 | |
5260986 | Pershan | Nov 1993 | |
5513126 | Harkins et al. | Apr 1996 | |
5592541 | Fleischer, III et al. | Jan 1997 | |
5630060 | Tang et al. | May 1997 |
Entry |
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"Subscriber Service Applications", http:/www.bostontechnology.com/ssa-vm.htm, date unknown. |