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低鈷定膨脹瓷封合金4J46技術條件

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