Chusei Seki

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Gold alloy for black coloring, processed article of black colored g...
- Patent number 5,139,739
- Issue date Aug 18, 1992
- Agency of Industrial Science and Technology
- Takeshi Takayanagi
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...