Patent US20040231894 - Rotary tools or bits - Google Patenten
tons, tungsten is extraordinarily heavy, with a density two and a half times that of iron, and equal to that of gold. And in hardness tungsten carbide is second only to the diamond. Tungsten carbide is the hardest metallic substance yet made use of by man. Tungsten's quality characteristics are not equalled by those of any ...
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