Electronic alarm

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

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D14 57

Patent

active

D02740486

REFERENCES:
patent: D242778 (1976-12-01), Goble et al.
patent: D242779 (1976-12-01), Goble et al.
patent: D254727 (1980-04-01), Mitumori
patent: D260008 (1981-07-01), Wistrand
patent: D261118 (1981-10-01), Perhacs, Jr.
patent: 3465325 (1969-09-01), Goldfarb et al.
patent: 3537094 (1970-10-01), Hawkins et al.
patent: 3890513 (1975-06-01), Barleen

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