Communication with the ESLs is accomplished using communication base stations 206A and 206B and {HEAD ~ reading} of the RFID tags is accomplished using portable RFID readers 208A and {TAIL ~ 208B} 
is accomplished using
Communication with the ESLs is accomplished using communication base stations 206A and 206B and { HEAD ~ reading } of the RFID tags is accomplished using portable RFID readers 208A and { TAIL ~ 208B }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL