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Communication system
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Patent number 5,023,604
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Issue date Jun 11, 1991
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Hitachi, Ltd.
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Akihiko Takase
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Time domain multiplexer
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Patent number 4,504,943
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Issue date Mar 12, 1985
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Hitachi, Ltd.
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Katsuyuki Nagano
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Variable equalizer
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Patent number 4,459,698
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Issue date Jul 10, 1984
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Hitachi, Ltd.
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Osamu Yumoto
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Variable equalizer
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Patent number 4,262,263
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Issue date Apr 14, 1981
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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 4,204,176
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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