Electronic buzzer or similar article

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

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D1006

Patent

active

D02547309

REFERENCES:
patent: 3760411 (1973-09-01), Youhanaian
patent: 3887914 (1975-06-01), Sato et al.
patent: 3974499 (1976-10-01), Shigemori et al.

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