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Yuichi Yamada
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Kamifukuoka-shi, JP
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last 30 patents
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Patent Grant
Optical transmission system, its method, and optical amplification...
Patent number
6,744,989
Issue date
Jun 1, 2004
KDDI Corporation
Takehiro Tsuritani
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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last 30 patents
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Patent Application
Optical transmission system, its method, and optical amplification...
Publication number
20020003647
Publication date
Jan 10, 2002
Takehiro Tsuritani
H04 - ELECTRIC COMMUNICATION TECHNIQUE