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Ultrasonic wave conversion apparatus
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Patent number 4,486,868
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Issue date Dec 4, 1984
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Nippon Soken, Inc.
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Masao Kodera
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B06 - GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
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Capacitance sensing device
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Patent number 4,354,219
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Issue date Oct 12, 1982
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Nippon Soken, Inc.
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Sigeyuki Akita
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G01 - MEASURING TESTING
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Liquid sensor
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Patent number 4,121,457
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Issue date Oct 24, 1978
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Nippon Soken, Inc.
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Shuzo Yoshida
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G01 - MEASURING TESTING
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