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FM demodulation circuit
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Patent number 4,884,037
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Issue date Nov 28, 1989
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Yamaha Corporation
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Akira Sogo
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H03 - BASIC ELECTRONIC CIRCUITRY
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3843931
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Patent number 3,843,931
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Issue date Oct 22, 1974
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3764927
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Patent number 3,764,927
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Issue date Oct 9, 1973
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H03 - BASIC ELECTRONIC CIRCUITRY
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3748586
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Patent number 3,748,586
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Issue date Jul 24, 1973
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H03 - BASIC ELECTRONIC CIRCUITRY