| http://www.w3.org/ns/prov#value | - Component C preferably incorporates lithium, sodium, magnesium, aluminum, potassium, calcium, manganese, tungsten, titanium, iron, cobalt, nickel, hafnium, copper, zinc, barium, zirconium, or tin in the form of a metal salt, such as metal hydroxide, metal carbonate, metal acetate, or mixtures of these.
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