Ultrasonic intrusion alarm

Details Ultrasonic intrusion alarm Ultrasonic intrusion alarm

1975-07-10

1976-12-21

Mercer, Susie J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D1006

Patent

active

D02427796

REFERENCES:
patent: 2870434 (1959-01-01), Schulze
patent: 3135950 (1964-06-01), Finkle
patent: D233931 (1974-12-01), Goble et al.

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