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Transmission line protection system
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Patent number 4,675,773
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Issue date Jun 23, 1987
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Hitachi, Ltd.
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Shingo Shirakawa
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Gas-insulated switchgear apparatus
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Patent number 4,658,329
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Issue date Apr 14, 1987
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Hitachi, Ltd.
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Yukio Kamura
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Gas-insulated switchgear equipment
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Patent number 4,570,202
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Issue date Feb 11, 1986
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Hitachi, Ltd.
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Isao Nishida
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Gas-insulated switchgear apparatus
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Patent number 4,215,256
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Issue date Jul 29, 1980
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Hitachi, Ltd.
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Minoru Sakaguchi
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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