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Radio frequency automatic identification system

  • US 5,204,681 A
  • Filed: 09/24/1991
  • Issued: 04/20/1993
  • Est. Priority Date: 09/24/1991
  • Status: Expired due to Term
First Claim
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1. A target for use in an automatic identification system comprising a plurality of independent solid bulk resonators, the resonators in said target resonating at a plurality of radio frequencies.

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