| 摘要 |
PCT No. PCT/GB91/00952 Sec. 371 Date Jan. 25, 1993 Sec. 102(e) Date Jan. 25, 1993 PCT Filed Jun. 13, 1991 PCT Pub. No. WO91/19997 PCT Pub. Date Dec. 26, 1991.A transponder system comprising an interrogating source of HF electromagnetic radiation, and a plurality of transponders which each include a token reader unit to receive a removable token, e.g., a smart card, including onboard data processing capability. The transponders, or a group of transponders, are each arranged when interrogated to transmit a unique HF response modulated by information taken upon the token.
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