| 摘要 |
The invention relates to a device for monitoring persons or entities, which comprises: sensor means responsive to the presence of an entity for generating a signal; clock means for measuring the passage of time; digital data processing means connected to the sensor means and to the clock means for correlating each signal from the sensor means with time as measured by the clock means; and digital storage means connected to the data processing means for storing each correlated signal [as data] for use in analysing the presence of entities at the sensor means. <IMAGE>
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