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Tank-type surge arrester
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Patent number 5,959,823
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Issue date Sep 28, 1999
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Hitachi, Ltd.
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Shingo Shirakawa
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H01 - BASIC ELECTRIC ELEMENTS
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Oxide resistor
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Patent number 4,943,795
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Issue date Jul 24, 1990
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Hitachi, Ltd.
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Takeo Yamazaki
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H01 - BASIC ELECTRIC ELEMENTS
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Oxide resistor
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Patent number 4,736,183
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Issue date Apr 5, 1988
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Hitachi, Ltd.
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Takeo Yamazaki
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H01 - BASIC ELECTRIC ELEMENTS
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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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Lightning arrester
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Patent number 4,502,089
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Issue date Feb 26, 1985
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Hitachi, Ltd.
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Jun Ozawa
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H01 - BASIC ELECTRIC ELEMENTS
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Zinc-oxide surge arrester
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Patent number 4,262,318
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Issue date Apr 14, 1981
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Hitachi, Ltd.
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Shingo Shirakawa
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H01 - BASIC ELECTRIC ELEMENTS