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Combined microphone and loudspeaker
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Patent number D275096
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Issue date Aug 14, 1984
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AT&T Bell Laboratories
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Edward W. Festa
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D14 - Recording, communication, or information retrieval equipment
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Microphone
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Patent number D275097
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Issue date Aug 14, 1984
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AT&T Bell Laboratories
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Edward W. Festa
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D14 - Recording, communication, or information retrieval equipment
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Telephone set base enclosure
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Patent number D257978
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Issue date Jan 20, 1981
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Bell Telephone Laboratories, Incorporated
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Edward W. Festa
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D14 - Recording, communication, or information retrieval equipment