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Level detector
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Patent number 4,513,209
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Issue date Apr 23, 1985
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Matsushita Electric Industrial Co., Ltd.
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Kenzo Tanabe
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G01 - MEASURING TESTING
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Transistor balanced mixer
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Patent number 4,461,042
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Issue date Jul 17, 1984
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Matsushita Electric Industrial Co., Ltd.
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Kenzo Tanabe
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H03 - BASIC ELECTRONIC CIRCUITRY
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Balanced modulator
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Patent number 4,344,188
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Issue date Aug 10, 1982
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Matsushita Electric Industrial Co., Ltd.
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Kenzo Tanabe
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H03 - BASIC ELECTRONIC CIRCUITRY