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Gas insulated switchgear device
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Patent number 5,453,910
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Issue date Sep 26, 1995
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Hitachi, Ltd.
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Syunji Itou
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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 4,638,403
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Issue date Jan 20, 1987
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Hitachi, Ltd.
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Naoki Amano
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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 4,503,481
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Issue date Mar 5, 1985
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Hitachi, Ltd.
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Sigeru Fujiya
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER