| 摘要 |
The method involves first and second devices sending first and second signals to the communications center with ID codes, the center comparing the signals in accordance with a predetermined characteristic and checking for coincidence, the center sending a display signal to at least one device if coincidence is detected indicating that this is the cases and especially including an ID code for the device. Independent claims are also included for the following: a communications center with a computer unit for implementing the method.
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