Anti-theft protection systems responsive to bath resonance and m

Details Anti-theft protection systems responsive to bath resonance and m Anti-theft protection systems responsive to bath resonance and m

1993-12-06

1995-02-21

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340521, 340551, G08B 13187

Patent

active

053920287

ABSTRACT:
Tagged articles are protected against theft by a system responding to articles having affixed thereto both a resonant circuit and a magnetizable strip. In one embodiment, a label alarm detector responds only to the presence of a resonant circuit or alternatively, only to the presence of a magnetizable strip. In a further embodiment, a label alarm detector responds to both presence of a resonant circuit and presence of a magnetizable strip.

REFERENCES:
patent: 4660024 (1987-04-01), McMaster
patent: 5081445 (1992-01-01), Gill et al.
patent: 5119070 (1992-06-01), Matsumoto et al.
patent: 5204527 (1993-04-01), Yamashita et al.

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