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torage and retrieval of diverse types of information obtained from different media sources which includes video, audio, and text transcriptionsUS576835516 May 199616 Jun 1998Science Dynamics CorporationThree-way call detection systemUS5781611 *13 Jun 199614 Jul 1998Samsung Electronics Co., Ltd.Method and apparatus for monitoring status of speech connection between central office linesUS579681111 M
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