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Digital telephone
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Patent number 5,652,753
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Issue date Jul 29, 1997
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Alcatel N.V.
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Dieter Kopp
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Office communication system
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Patent number 5,265,205
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Issue date Nov 23, 1993
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Grundig E. M. V.
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Gunter Schroder
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Communication terminal device
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Patent number 5,042,028
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Issue date Aug 20, 1991
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Kabushiki Kaisha Toshiba
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Fukushige Ogawa
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Call announcement arrangement
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Patent number 5,007,076
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Issue date Apr 9, 1991
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AT&T Bell Laboratories
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James R. Blakley
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Telephone station set
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Patent number 4,922,490
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Issue date May 1, 1990
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American Telephone and Telegraph Company
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James R. Blakley
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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