Doorbell

Details Doorbell Doorbell

1992-03-06

1993-09-28

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03397602

REFERENCES:
patent: D241316 (1976-09-01), Hoskins
patent: D290098 (1987-06-01), Jameson
patent: D315528 (1991-03-01), Hickolett
patent: 1221700 (1917-04-01), Deicke
patent: 4455963 (1984-06-01), Matsuo

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