| 摘要 |
A system for protecting portable articles from unwanted use. The system includes a portable transmitter external to the article for transmitting coded signals of fixed radio frequency pulses to an electronic mechanism installed in the article. The mechanism includes a mode selector for operating the system in a first, second or third mode. There is also a device for activating an electronic flash, an alarm or other similar protective mechanisms during any of the modes, and a device for neutralizing the activating device.
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