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Auto focus camera
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Patent number 5,146,262
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Issue date Sep 8, 1992
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Seikosha Co. Ltd.
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Shinji Nagaoka
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G02 - OPTICS
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Rangefinder for camera
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Patent number 5,008,695
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Issue date Apr 16, 1991
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Seikosha Co., Ltd.
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Shinji Nagaoka
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G02 - OPTICS
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Flash photography changeover device
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Patent number 4,929,977
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Issue date May 29, 1990
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Seikosha Co., Ltd.
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Tadashi Ishikawa
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY