Doorbell or similar article

Details Doorbell or similar article Doorbell or similar article

1988-11-10

1991-01-08

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03135705

REFERENCES:
patent: D180406 (1957-06-01), Jolly
patent: D250638 (1978-12-01), Donnelly
patent: D272993 (1984-03-01), Chan

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