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Gain control circuit
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Patent number 4,292,596
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Issue date Sep 29, 1981
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Hitachi, Ltd.
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Kohei Ishizuka
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H03 - BASIC ELECTRONIC CIRCUITRY
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Variable equalizer
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Patent number 4,204,176
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Issue date May 20, 1980
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Hitachi, Ltd.
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Yoshitaka Takasaki
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Variable equalizer
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Patent number 4,187,479
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Issue date Feb 5, 1980
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Hitachi, Ltd.
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Kohei Ishizuka
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Variable equalizer
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Patent number 4,122,417
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Issue date Oct 24, 1978
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Hitachi, Ltd.
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Yoshitaka Takasaki
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Variable equalizer
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Patent number 4,101,851
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Issue date Jul 18, 1978
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Hitachi, Ltd.
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Kohei Ishizuka
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H04 - ELECTRIC COMMUNICATION TECHNIQUE