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Akihiro Shimizu
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Yokosuka, JP
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last 30 patents
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Patent Grant
Contents transmission control method with user authentication funct...
Patent number
6,115,472
Issue date
Sep 5, 2000
Nippon Telegraph & Telephone Corporation
Akihiro Shimizu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Patent Grant
Data randomization equipment
Patent number
4,850,019
Issue date
Jul 18, 1989
Nippon Telegraph & Telephone Corporation
Akihiro Shimizu
H04 - ELECTRIC COMMUNICATION TECHNIQUE