Ultrasonic intrusion detector

Details Ultrasonic intrusion detector Ultrasonic intrusion detector

1980-02-07

1982-11-23

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D1005

Patent

active

D02669960

REFERENCES:
patent: D219316 (1970-11-01), Lohr
patent: D226539 (1973-03-01), Pearsall
Nutone Catalog, .COPYRGT.1979, p. 35, Ultrasonic Motion Detector.

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