Combined intrusion detector and alarm

Details Combined intrusion detector and alarm Combined intrusion detector and alarm

1977-04-15

1978-10-03

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D1005

Patent

active

D02497786

REFERENCES:
patent: D191581 (1961-10-01), Scharfenberg et al.
patent: D222941 (1972-02-01), Knutson
patent: 3623088 (1971-11-01), Peterson
New Equipment Digest, Mar. 1976, p. 56, Back-up alarm.

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