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Sound field controller
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Patent number 5,572,591
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Issue date Nov 5, 1996
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Matsushita Electric Industrial Co., Ltd.
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Hiroko Numazu
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Sound field controller
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Patent number 5,381,482
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Issue date Jan 10, 1995
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Matsushita Electric Industrial Co., Ltd.
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Masaharu Matsumoto
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Music/voice discriminating apparatus
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Patent number 5,375,188
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Issue date Dec 20, 1994
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Matsushita Electric Industrial Co., Ltd.
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Mitsuhiko Serikawa
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Sound field variable apparatus
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Patent number 5,233,661
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Issue date Aug 3, 1993
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Matsushita Electric Industrial Co., Ltd.
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Akihisa Kawamura
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H04 - ELECTRIC COMMUNICATION TECHNIQUE