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Photometric circuit
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Patent number 4,980,545
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Issue date Dec 25, 1990
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Seikosha Co., Ltd.
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Yoichi Seki
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G01 - MEASURING TESTING
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Circuit for detecting back light
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Patent number 4,945,378
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Issue date Jul 31, 1990
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Seikosha Co., Ltd.
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Shinji Nagaoka
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Power circuit for camera
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Patent number 4,831,406
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Issue date May 16, 1989
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Seikosha Co., Ltd.
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Youichi Seki
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G06 - COMPUTING CALCULATING COUNTING
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Shutter control device for camera
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Patent number 4,763,155
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Issue date Aug 9, 1988
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Seikosha Co., Ltd.
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Hajime Oda
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY