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Piezoelectric speaker
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Patent number 6,978,032
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Issue date Dec 20, 2005
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Matsushita Electric Industrial Co., Ltd.
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Takashi Ogura
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Diaphragm for loudspeakers
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Patent number 4,803,242
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Issue date Feb 7, 1989
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Matsushita Electric Inductrial Co., Ltd.
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Kousaku Murata
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Diaphragm for loudspeaker
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Patent number 4,487,877
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Issue date Dec 11, 1984
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Matsushita Electric Industrial Co., Ltd.
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Takashi Takeda
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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