Door alarm

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

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D1005

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D02641941

REFERENCES:
patent: D236817 (1975-09-01), Sweany
patent: D240121 (1976-06-01), Pasquarette
patent: D246034 (1977-10-01), Sparks et al.
patent: D248283 (1978-06-01), Kitts et al.
patent: 2822534 (1958-02-01), Miller
patent: 3465325 (1969-09-01), Goldfarb et al.
patent: 3537094 (1970-10-01), Hawkins et al.
Best Products Buyer's Guide, 1975, p. 160B, Apartment Alarm With Delay.
Popular Science, 5-1978, p. 103, Water Detector.

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