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Communication switch
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Patent number 5,953,330
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Issue date Sep 14, 1999
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Lucent Technologies Inc.
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Ronald Jay Canniff
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Loopback test
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Patent number 4,380,810
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Issue date Apr 19, 1983
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Bell Telephone Laboratories, Incorporated
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Ronald J. Canniff
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Multiparty telephone ringing
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Patent number 4,048,448
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Issue date Sep 13, 1977
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Bell Telephone Laboratories, Incorporated
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Ronald Jay Canniff
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H04 - ELECTRIC COMMUNICATION TECHNIQUE