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Optical amplifier
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Patent number 6,020,991
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Issue date Feb 1, 2000
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KDD Corporation
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Mimura Yoshinori
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Solid state laser
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Patent number 5,349,600
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Issue date Sep 20, 1994
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Kokusai Denshin Denwa Kabushiki Kaisha
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Osamu Shinbori
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H01 - BASIC ELECTRIC ELEMENTS
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Light emitting device
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Patent number 4,773,075
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Issue date Sep 20, 1988
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Kukusai Denshin Denwa Kabushiki Kaisha
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Shigeyuki Akiba
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G02 - OPTICS
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Semiconductor photo device
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Patent number 4,729,004
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Issue date Mar 1, 1988
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Kokusai Denshin Denwa Kabushiki Kaisha
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Kazuo Sakai
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H01 - BASIC ELECTRIC ELEMENTS
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