Ultrasonic intrusion alarm

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof

Patent

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D1006

Patent

active

D02427788

REFERENCES:
patent: 3135950 (1964-06-01), Finkle
patent: 3681603 (1972-08-01), Scheidweiler et al.
patent: D211427 (1968-06-01), Brubaker
patent: D233931 (1974-12-01), Goble et al.

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