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Mechanical filter
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Patent number 4,633,204
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Issue date Dec 30, 1986
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Fujitsu Limited
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Takashi Gounji
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H03 - BASIC ELECTRONIC CIRCUITRY
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Mechanical filter
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Patent number 4,555,682
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Issue date Nov 26, 1985
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Fujitsu Limited
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Takashi Gounji
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H03 - BASIC ELECTRONIC CIRCUITRY
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Mechanical filter
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Patent number 4,314,216
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Issue date Feb 2, 1982
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Fujitsu Limited
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Takashi Gounji
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H03 - BASIC ELECTRONIC CIRCUITRY
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Flexural transducer
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Patent number 4,281,298
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Issue date Jul 28, 1981
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Fujitsu Limited
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Takashi Gounji
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B06 - GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
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Electromechanical filter
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Patent number 4,241,321
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Issue date Dec 23, 1980
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Fujitsu Limited
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Yoshihiko Kasai
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H03 - BASIC ELECTRONIC CIRCUITRY