Article theft detection

Details Article theft detection Article theft detection

1980-08-21

1982-03-23

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

343 68LC, G08B 1318

Patent

active

043215866

ABSTRACT:
An electronic article theft detection system accurately senses the presence of a target on a protected article by sensing electromagnetic disturbances at a plurality of frequences, comparing their relative amplitudes and producing a detection signal when the compared relative amplitudes correspond to those produced by the presence of a target.

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