| 摘要 |
The device is activated by an entry terminal and deactivated by an exit terminal or by a button (5). A communication network is selected by a selector (4), and a button (6) is pressed, thus causing a signal to be emitted by the emitter (14) and received by receivers (15) in other cars. A sound alarm (8) is activated on reception of the signal, and a bargraph (13) records the level of the signal using a chip card (7), and an antenna (16) indicates the location of the signaling car
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