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Noise reduction circuit
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Patent number 4,636,863
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Issue date Jan 13, 1987
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Hitachi, Ltd.
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Kazuhiro Kaizaki
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Channel selection apparatus
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Patent number 4,363,134
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Issue date Dec 7, 1982
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Hitachi, Ltd.
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Toshinori Murata
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H03 - BASIC ELECTRONIC CIRCUITRY
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Channel indicator
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Patent number 4,270,215
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Issue date May 26, 1981
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Hitachi, Ltd.
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Toshinori Murata
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H03 - BASIC ELECTRONIC CIRCUITRY
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