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鐵鎳鈷玻封合金4J29和4J44技術條件

Glass sealed iron-cobalt alloys 4J29 and 4J44 technical requirement
標準號:YB/T 5231-1993
Glass sealed iron-cobalt alloys 4J29 and 4J44 technical requirement
標準號:YB/T 5231-1993