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Shigeyuki Tsurumi
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Mito, JP
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last 30 patents
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Patent Grant
Electric contact material and method of producing the same
Patent number
4,330,331
Issue date
May 18, 1982
Nippon Telegraph & Telephone Public Corporation
Koichi Fujiwara
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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Patent Grant
Electrical contact material
Patent number
4,279,649
Issue date
Jul 21, 1981
Nippon Telegraph & Telephone Public Corporation
Koichi Fujiwara
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...