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Light control sheets
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Patent number 5,108,857
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Issue date Apr 28, 1992
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Sumitomo Chemical Company, Limited
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Shinichiro Kitayama
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G02 - OPTICS
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Laminated structure
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Patent number 4,956,227
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Issue date Sep 11, 1990
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Nippon Sheet Glass Co., Ltd.
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Naoto Hirayama
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B32 - LAYERED PRODUCTS
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Light control sheets
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Patent number 4,929,523
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Issue date May 29, 1990
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Sumitomo Chemical Company Limited
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Shinichiro Kitayama
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G02 - OPTICS