(under the class definition) Products or processes in which the product is a compound of a metal which is a member of the "rare earth" or lanthanide series and which has an atomic number of 21, 39, or 57 through 71.
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21.1+, for a process of treating a mixture containing a rare earth metal to obtain a compound of the metal.
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588, Hazardous or Toxic Waste Destruction or Containment, appropriate subclasses for the destruction or containment of hazardous or toxic waste containing rare earth or lanthanide elements (atomic numbers 21, 39, or 57-71).
