Security apparatus
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United States of America Patent
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-
Apr 10, 1990
Grant Date -
N/A
app pub date -
Mar 21, 1989
filing date -
Mar 22, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Security apparatus which has an outer concertina coil of barbed tape with an inner coiled electrical conductor, which may also be made from a concertina coil of barbed tape, positioned within the outer concertina coil and supported therefrom by means of insulators which prevent the conductor from coming in to electrical contact with the outer concertina coil.
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