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A comment on Researchers produce nearly-pure rare earth concentrates from coal. Parent comment

Re:Researchers produce nearly-pure rare earth concentrates f... by topspin on Monday March 12, 2018 @02:11PM (#16570124)
Yttrium is used to make high performance filters and oscillators. YIG filters and oscillators are wide band high Q microwave devices used in high performance instruments, radar and frequency agile communication systems. An example would be the AN/ALQ-161A B1-B countermeasure system.
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