Tohru Ishii

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Shinjuku, JP

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Patents Grantslast 30 patents

Information Patent Grant
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- Patent number 5,078,427
- Issue date Jan 7, 1992
- Dai Nippon Insatsu Kabushiki Kaisha
- Tohru Ishii
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
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- Patent number 4,984,823
- Issue date Jan 15, 1991
- Dai Nippon Insatsu Kabushiki Kaisha
- Tohru Ishii
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS