Electric buzzer

Details Electric buzzer Electric buzzer

1976-05-11

1978-06-13

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D1006

Patent

active

D02481510

REFERENCES:
patent: 3938141 (1976-02-01), Neuhof
patent: 3974499 (1976-08-01), Shigemori

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