- hafnium test blade
- Engineering: HTB
Универсальный русско-английский словарь. Академик.ру. 2011.
hafnium test blade
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Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… … Wikipedia
