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低钴定膨胀瓷封合金4J46技术条件

Porcelain sealed alloy 4J46 with permanent expansion and low cobalt teehnical requirement
标准号:YB/T 5232-1993
Porcelain sealed alloy 4J46 with permanent expansion and low cobalt teehnical requirement
标准号:YB/T 5232-1993