Ultrasonic object detection device

Details Ultrasonic object detection device Ultrasonic object detection device

1986-12-22

1990-06-05

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03083470

REFERENCES:
patent: D260741 (1981-09-01), Lam
patent: D271573 (1983-11-01), Wada et al.
Annunciator Interface Module on p. 54 of Electrical Cousultant May/Jun. 1979.
Smoke and Burglar Alarm on p. 170 of Good Housekeeping, 2-1980.

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