black copper
black copper, Total:2 items.
The international standard classification for "black copper" includes: Products of non-ferrous metals .
The Chinese standard classification for "black copper" includes: Secondary nonferrous metals and their alloys .
Professional Standard - Non-ferrous Metal
- YS/T 632-2007 Low Grade Blister
工业和信息化部
- YS/T 632-2020 Low grade blister
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