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Acoustic transducer
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Patent number 6,175,637
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Issue date Jan 16, 2001
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Sony Corporation
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Masao Fujihira
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Acoustic transducer
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Patent number 6,035,052
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Issue date Mar 7, 2000
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Sony Corporation
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Masao Fujihira
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Optical recording disc recycling method
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Patent number 5,972,159
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Issue date Oct 26, 1999
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Sony Corporation
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Masaru Uryu
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Speaker apparatus
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Patent number 5,909,496
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Issue date Jun 1, 1999
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Sony Corporation
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Jun Kishigami
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Speaker apparatus
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Patent number 5,862,237
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Issue date Jan 19, 1999
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Sony Corporation
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Jun Kishigami
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Loudspeaker
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Patent number 4,252,211
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Issue date Feb 24, 1981
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Sony Corporation
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Atsushi Matsuda
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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