Siren horn housing

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

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D1006

Patent

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D02438348

REFERENCES:
patent: D44589 (1913-08-01), Scognamillo
patent: D44590 (1913-08-01), Scognamillo
Electronics, vol. 48, No. 1, Jan. 9, 1975, p. 119, Speakers on second row middle and bottom row right.

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