A passive RF tag is disclosed in which the tag contains a tag oscillator for determining the modulation frequency of modulating the backscatter signal, and the tag oscillator frequency is stabilized when the tag modulates the backscatter signal.

 
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< Combination radio frequency identification transponder (RFID tag) and magnetic electronic article surveillance (EAS) tag

< Modulation of the resonant frequency of a circuit using an energy field

> Data collection device having visual display of feedback indicators and messages

> Conditionally illuminated keypad legends
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