- Unit Price: 8~9USD
- Brand: shengyu
- Packaging: Carton+ wooden case
- Supply Ability: 10000000pcs
- Min. Order: 100 Piece/Pieces
- Certificate: ISO9001
The History of Metal Casting The oldest known metal casting is that of a copper frog, believed to have been produced in 3200 BCE in Mesopotamia when copper was a popularly used material. Later, around 2000 BCE, iron was discovered. But it was not...
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