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Bass speaker
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Patent number 5,850,460
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Issue date Dec 15, 1998
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Matsushita Electric Industrial Co., Ltd.
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Shoji Tanaka
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Motion-picture screen
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Patent number 5,140,460
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Issue date Aug 18, 1992
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Matsushita Electric Industrial Co., Ltd.
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Suemei Fukuhara
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Loudspeaker system
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Patent number 5,073,945
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Issue date Dec 17, 1991
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Matsushita Electric Industrial Co., Ltd.
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Satoshi Kageyama
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H04 - ELECTRIC COMMUNICATION TECHNIQUE