Burglar alarm for doors

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

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D03494659

REFERENCES:
patent: 213936 (1879-04-01), Reese
patent: D325356 (1992-04-01), Kin Man Jse
patent: D336054 (1993-06-01), Zitherland
patent: 468557 (1892-02-01), Andrews
patent: 2570438 (1951-10-01), Flagge
patent: 4118691 (1978-10-01), Sims
patent: 4910497 (1990-03-01), Seachris
patent: 4967083 (1990-10-01), Kornbrekke et al.
patent: 5097253 (1992-03-01), Eschbach et al.
patent: 5132667 (1992-07-01), Cranford

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