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Call management system
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Patent number 5,027,391
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Issue date Jun 25, 1991
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Call Management Products, Inc.
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John F. O'Neill
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Signal limiting circuit
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Patent number 4,169,215
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Issue date Sep 25, 1979
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Bell Telephone Laboratories, Incorporated
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Dennis B. James
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Four-wire integrable hybrid
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Patent number 4,032,718
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Issue date Jun 28, 1977
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Bell Telephone Laboratories, Incorporated
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John Francis O'Neill
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Nonlocking key telephone set
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Patent number 4,021,622
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Issue date May 3, 1977
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Bell Telephone Laboratories, Incorporated
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John Francis O'Neill
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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