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Electrical contact material
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Issue date Jul 21, 1981
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Nippon Telegraph & Telephone Public Corporation
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Koichi Fujiwara
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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3771326
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Patent number 3,771,326
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D04 - BRAIDING LACE-MAKING KNITTING TRIMMINGS NON-WOVEN FABRICS
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3721550
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Patent number 3,721,550
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Issue date Mar 20, 1973
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B22 - CASTING POWDER METALLURGY
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3638293
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Patent number 3,638,293
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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3610859
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Patent number 3,610,859
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B22 - CASTING POWDER METALLURGY
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3518390
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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H01 - BASIC ELECTRIC ELEMENTS
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2997524
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H01 - BASIC ELECTRIC ELEMENTS
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2914640
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H01 - BASIC ELECTRIC ELEMENTS
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2733319
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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2234969
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H01 - BASIC ELECTRIC ELEMENTS