Power tool theft alarm

作者: Jr. John C. Wirth

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摘要: The internal impedance loads of a plurality electrical appliances on display are directly connected in series through their power switches and cords by connector strip to form detection circuit. Interruption the circuit is sensed relay activate operated alerting device. Continuity maintained plugging all into holding closed removable binding tape or like.

参考文章(2)
Lewin Herman, Landa Edward, Tool sales display theft alarm ,(1961)