Ultrasonic intrusion detector

Details Ultrasonic intrusion detector Ultrasonic intrusion detector

1977-02-16

1978-08-15

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D1006

Patent

active

D02489309

REFERENCES:
patent: D217037 (1970-03-01), Weinstock
patent: D243513 (1977-03-01), Galvin et al.
patent: 3747109 (1973-07-01), Corbell et al.
patent: 3980998 (1976-09-01), McIntosh
New Equipment Digest, Nov. 1973, p. 48, Intrusion Alarm (bottom).

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