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INFRARED-EXCITABLE YTTERBIUM SENSITIZED ERBIUM OR THULIUM ACTIVATED RARE EARTH FLOURIDE LUMINESCENT MATERIAL

  • US 3,541,018 A
  • Filed: 09/18/1968
  • Issued: 11/17/1970
  • Est. Priority Date: 09/18/1968
  • Status: Expired due to Term
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