| http://www.w3.org/ns/prov#value | - The fully dense rare earth material is known to the art and to the literature and often contains neodymium, samarium, praseodymium, iron, cobalt, and other alloying elements such as aluminum, boron, carbon, chromium, copper, gallium, hafnium, manganese, niobium, tantalum, titanium, vanadium, zirconium, and the like.
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