Siren horn housing

Details Siren horn housing Siren horn housing

1975-06-23

1977-03-29

Mercer, Susie J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D1006

Patent

active

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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