Tsuyoshi Shigetomi

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Saitama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Device for judging brilliancy of precious stones such as diamonds o...
- Patent number 4,647,194
- Issue date Mar 3, 1987
- J.P. M. Ltd. Co.
- Tsuyoshi Shigetomi
- G01 - MEASURING TESTING