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Vented headset speaker
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Patent number 5,555,554
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Issue date Sep 10, 1996
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Stanton Magnetics, Inc.
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Alan Hofer
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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-
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Headset for underwater use
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Patent number 4,949,806
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Issue date Aug 21, 1990
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Stanton Magnetics, Inc.
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Alan Hofer
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Phonograph cartridge
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Patent number D278147
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Issue date Mar 26, 1985
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Pickering & Company, Inc.
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John Kuykendall
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D14 - Recording, communication, or information retrieval equipment
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Collapsible headset
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Patent number D266244
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Issue date Sep 21, 1982
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Pickering & Company, Inc.
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Alan Hofer
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D14 - Recording, communication, or information retrieval equipment
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Speaker
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Patent number 4,315,112
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Issue date Feb 9, 1982
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Alan Hofer
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Inertial microphone system
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Patent number 4,006,318
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Issue date Feb 1, 1977
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Dyna Magnetic Devices, Inc.
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George J. Sebesta
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H04 - ELECTRIC COMMUNICATION TECHNIQUE