Electronic Monitoring System.
DEPARTMENT OF THE ARMY WASHINGTON DC
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The invention relates to a system for monitoring and recording the position of mobile objects relative to one or more defined areas. Each monitored area includes a transmitter which transmits an identification number for that particular area. A receiver is carried by a mobile object. When the receiver enters or exist the monitored zone, it records the transmitter identification number and the times of entry to and exit from the monitored zone. Author
- Non-Radio Communications