| 摘要 |
A system for monitoring mobile personal items which are equipped with a radio-frequency tag includes user equipment having a number of elements. The user equipment includes a radio frequency tag detector which is capable of detecting a radio frequency tag. The user equipment is also capable of performing an earlier and a later operation of the detector, and compares the outputs of the detector for the earlier and later operations and provides a monitor output dependent on the comparison. The monitor output indicates whether a personal item which is detected as being present on the earlier operation is present on the later operation.
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