Radio frequency based multiple frequency, multiple communications protocol reading devices, namely, RFID readers, RFID reader/writers for reading data from and writing data to the memory of an RFID transponder, interrogators for determining when an RFID transponder is within the range of a reader or reader/writer by sending signals into the space surrounding the interrogator, and a programmer for writing computer software or data to the microprocessor of an RFID transponder via radio frequency signals

'base':3 'communic':7 'comput':60 'data':18,22,63 'determin':32 'devic':10 'frequenc':2,5,73 'interrog':30,54 'memori':25 'microprocessor':66 'multipl':4,6 'name':11 'programm':57 'protocol':8 'radio':1,72 'rang':40 'read':9,17 'reader':13,43 'reader/writer':45 'reader/writers':15 'rfid':12,14,28,35,69 'send':47 'signal':48,74 'softwar':61 'space':51 'surround':52 'transpond':29,36,70 'via':71 'within':38 'write':21,59

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