Alarm repeater

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

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D1005

Patent

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D02652994

REFERENCES:
patent: D236817 (1975-09-01), Sweany
patent: D240121 (1976-06-01), Pasquarette
patent: 2822534 (1958-02-01), Miller
patent: 3537094 (1970-10-01), Hawkins et al.
Best Products Buyer's Book #118, 1975, p. 160 B, Apartment Alarm with Delay.
Popular Science, May 1978, p. 103, Water Detector.

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