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PROCESS FOR RECORDING AND RETRIEVING INFORMATION EMPLOYING PHOTOLUMINESCENT INKS WHICH LUMINESCE UNDER ULTRAVIOLET ILLUMINATION

  • US 3,473,027 A
  • Filed: 10/14/1966
  • Issued: 10/14/1969
  • Est. Priority Date: 03/08/1965
  • Status: Expired due to Term
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