Electromagnetic bell

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

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D03041638

REFERENCES:
patent: D149907 (1948-06-01), Rifkin
patent: 2189181 (1940-02-01), Rittenhouse
patent: 2290717 (1942-07-01), Swanson
patent: 4300128 (1981-11-01), Ishii

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