Explanatory notes
… of copper, nickel, silver, etc. Cobalt is a silvery, corrosion‑resistant metal, harder than nickel, and is the … it is used as a coating for other metals (by electrolytic deposition), as a catalyst, as a binder in the manufacture … which may fall in the heading in accordance with Note 5 to Section XV include : (1) The cobalt‑chromium‑tungsten …