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Vacuum switchgear
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Patent number 6,268,579
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Issue date Jul 31, 2001
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Hitachi, Ltd.
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Satoru Kajiwara
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Vacuum switching apparatus
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Patent number 6,107,592
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Issue date Aug 22, 2000
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Hitachi, Ltd.
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Ayumu Morita
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H01 - BASIC ELECTRIC ELEMENTS
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Vacuum circuit interrupter
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Patent number 5,594,224
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Issue date Jan 14, 1997
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Hitachi, Ltd.
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Toru Tanimizu
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H01 - BASIC ELECTRIC ELEMENTS
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Power board
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Patent number 5,483,417
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Issue date Jan 9, 1996
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Hitachi, Ltd.
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Toru Tanimizu
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Power receiving system
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Patent number 5,467,241
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Issue date Nov 14, 1995
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Hitachi, Ltd.
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Sinzi Sugitani
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Power board
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Patent number 5,278,723
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Issue date Jan 11, 1994
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Hitachi, Ltd.
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Toru Tanimizu
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Power board
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Patent number 5,216,575
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Issue date Jun 1, 1993
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Hitachi, Ltd.
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Toru Tanimizu
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER