Infrared intrusion alarm system capable of preventing false sign

Details Infrared intrusion alarm system capable of preventing false sign Infrared intrusion alarm system capable of preventing false sign

1983-12-06

1986-02-11

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250340, 250371, 340587, G08B 1318

Patent

active

045701571

ABSTRACT:
An alarm device responsive to entering or trespassing comprising:

REFERENCES:
patent: 3928843 (1975-12-01), Sprout et al.
patent: 4195286 (1980-03-01), Galvin

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