1.Nor can it be reckoned in the collective price of the rare metalsand precious stones that rest in the bowels of the African soil we tread in the footsteps of our ancestors.
2.Ferrous metals, non-ferrous metals, IC thin sections, coatings, ply-metals; Glass, ceramics, agate, precious stones;Hardness testing such as that on the depth and the trapezium of the carbonized layers and quench hardened layers.
