Double pulse magnetic markers

Details Double pulse magnetic markers Double pulse magnetic markers

1990-01-16

1991-05-21

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1324

Patent

active

050179071

ABSTRACT:
A ferromagnetic marker for an electronic surveillance system is magnetically biased so that the magnetic fields of two different regions thereof extend in different direction, e.g. in opposite directions.

REFERENCES:
patent: 4568921 (1986-02-01), Pokalsky
patent: 4686154 (1987-08-01), Mejia
patent: 4710752 (1987-12-01), Cordery
patent: 4935724 (1990-06-01), Smith

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