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Loudspeaker mounting system
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Patent number 6,721,434
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Issue date Apr 13, 2004
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Britannia Investment Corporation
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Matthew S. Polk
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G06 - COMPUTING CALCULATING COUNTING
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Bandpass woofer and method
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Patent number 5,475,764
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Issue date Dec 12, 1995
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Polk Investment Corporation
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Matthew S. Polk
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Enclosed speaker for vehicle use
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Patent number D350135
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Issue date Aug 30, 1994
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Polk Investment Corporation
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Matthew S. Polk
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D14 - Recording, communication, or information retrieval equipment
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Speaker cabinet
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Patent number D251973
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Issue date May 29, 1979
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George M. Klopfer
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D14 - Recording, communication, or information retrieval equipment