Combined housing for doorbell switch, signal system and message

Details Combined housing for doorbell switch, signal system and message Combined housing for doorbell switch, signal system and message

1983-11-07

1987-01-13

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D02877040

REFERENCES:
patent: 132632 (1976-06-01), Cogswell
patent: 1263961 (1918-04-01), Thomas
patent: 1758238 (1930-05-01), Peterson
patent: 3333912 (1967-08-01), Kunz et al.

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