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Mining
Of or pertaining to the process or business of extracting materials, such as ore or minerals, from the earth's crust.
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Mining > Mining tools 
Mohsovy stupnice
Mining; Mining tools
Stupnice pro měření a porovnání tvrdosti nerostů podle toho, jak snadné je škrábnutí jim.
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Sub-categories
- Coal mining (40)
- Diamond mining (39)
- General mining (41978)
- Gold mining (103)
- Mineral mining (36958)
- Minerals (696)
- Mining tools (94)
- Space mining (40)