Audible signal for alarm units

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible

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D03507050

REFERENCES:
patent: D201593 (1965-07-01), Stevenson
patent: D264196 (1982-05-01), Doggart
patent: 2984832 (1961-05-01), Gilman III et al.
patent: 3251056 (1966-05-01), Doggart
patent: 4075626 (1978-02-01), Sakaguchi et al.
patent: 4115770 (1978-09-01), Kanazawa
patent: 4303908 (1981-12-01), Enemark et al.
patent: 4366472 (1982-12-01), Ishii

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