| 摘要 |
Answering labels for protecting articles against theft. The invention consists in arranging the volume wave delay line of such label by providing a set of transducers (1-9) on the same substrate (50) designed (60) to obtain a series of distinct delays. The transducers are connected to an emitting-receiving antenna (40) by means of a connection system capable of being switched off by the user so as to obtain a coding known only to him. In order to improve the security system, the invention allows the user himself to personalize such a label.
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