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Naoyuki Yamaguchi
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Tokyo, JP
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last 30 patents
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Patent Grant
Audio teleconferencing apparatus
Patent number
5,548,638
Issue date
Aug 20, 1996
Iwatsu Electric Co., Ltd.
Naoyuki Yamaguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Patent Grant
Synchronizing system in digital communication line
Patent number
5,228,035
Issue date
Jul 13, 1993
Iwatsu Electric Co., Ltd.
Akira Hirato
H04 - ELECTRIC COMMUNICATION TECHNIQUE