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Radiation detector
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Patent number 4,937,454
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Issue date Jun 26, 1990
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Hitachi, Ltd.
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Haruo Itoh
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H01 - BASIC ELECTRIC ELEMENTS
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Solar cell
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Patent number 4,721,535
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Issue date Jan 26, 1988
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Director-General of the Agency of Industrial Science and Technology
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Haruo Itoh
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H01 - BASIC ELECTRIC ELEMENTS
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Semiconductor device
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Patent number 4,377,819
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Issue date Mar 22, 1983
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Hitachi, Ltd.
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Yoshio Sakai
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H01 - BASIC ELECTRIC ELEMENTS
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