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Dynamic callback technique
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Patent number 5,157,716
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Issue date Oct 20, 1992
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Scientific-Atlanta, Inc.
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David J. Naddor
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Dynamic callback technique
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Patent number 5,012,510
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Issue date Apr 30, 1991
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Scientific Atlantic Inc.
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Randolph J. Schaubs
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Two way communication system
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Patent number 4,958,381
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Issue date Sep 18, 1990
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Sony Corporation
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Masakatsu Toyoshima
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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