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Thermoplastic polyester resin stretched film
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Patent number 5,677,055
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Issue date Oct 14, 1997
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Oji-Yuka Synthetic Paper Co., Ltd.
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Ichiro Ohkawachi
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Piezoelectric or pyroelectric material
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Patent number 4,990,584
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Issue date Feb 5, 1991
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Mitsubishi Petrochemical Co., Ltd.
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Manabu Kishimoto
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Optical material
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Patent number 4,985,179
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Issue date Jan 15, 1991
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Mitsubishi Petrochemical Co., Ltd.
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Iwao Seo
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G02 - OPTICS
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