A single interrogation device interrogates a plurality of transponders arranged within the range of transmission of the interrogation device and identifies them without any mutual interference....http://www.google.es/patents/US5294931?utm_source=gb-gplus-sharePatente US5294931 - Method of interrogating a plurality of transponders arranged in the transmission range of an interrogating device and transponders for use in the said method
Method of interrogating a plurality of transponders arranged in the ...
