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Optical fiber cable
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Patent number 5,048,922
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Issue date Sep 17, 1991
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Kokusai Denshin Denwa Kabushiki Kaisha
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Kiyofumi Mochizuki
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G02 - OPTICS
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Optical amplification
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Patent number 4,923,291
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Issue date May 8, 1990
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Kokusai Denshin Denwa Kabushiki Kaisha
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Noboru Edagawa
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Optical de-polarizer
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Patent number 4,572,608
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Issue date Feb 25, 1986
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Kokusai Denshin Denwa Co., Ltd.
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Kiyofumi Mochizuki
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G02 - OPTICS
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