| http://www.w3.org/ns/prov#value | - When a transmitter and receiver such as shown in FIG. 4 was positioned to define an interrogation zone approximately 4 feet (120 cm) wide, it was found that a device 14 such as described hereinabove could be readily detected within the zone 70 so long as the major axis of the device was at an angle not greater than 60??? from a horizontal plane.
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