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Key input circuit
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Patent number 4,074,262
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Issue date Feb 14, 1978
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Hitachi, Ltd.
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Kosei Nomiya
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H03 - BASIC ELECTRONIC CIRCUITRY
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Constant current driving circuit
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Patent number 4,068,148
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Issue date Jan 10, 1978
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Hitachi, Ltd.
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Kosei Nomiya
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Gate circuit
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Patent number 4,027,173
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Issue date May 31, 1977
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Hitachi, Ltd.
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Kosei Nomiya
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H03 - BASIC ELECTRONIC CIRCUITRY
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