Jewelry - Watches

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Jewelry - Watches - Alton (Kansas) - September 18, 2020 64.00 Dollar US$

Coltan ore processing is a rare metal with a content of 0.0002% in the earth's crust, which is often co-existed with niobium in nature. Many minerala Contain tantalum mineral content, but seldom tantalum mineral mine(Ta/Nb ≥ 1), with industrial value...
Tin/Tungsten Ore Upgrade
Jewelry - Watches - Alton (Kansas) - September 18, 2020 53.00 Dollar US$

Because tin is soft and malleable, chemically stable, corrosion-resistant, fusible, low friction coefficient, and non-toxic tin salt, tin and tin alloys have been widely used in modern defense, modern industry, cutting-edge science and technology and...