Door chime housing

Details Door chime housing Door chime housing

1984-06-01

1986-06-10

Bullock, B. J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D02841711

REFERENCES:
patent: D120423 (1940-05-01), McMullen
patent: D134421 (1942-11-01), Dourson
patent: D235722 (1975-07-01), Rettiek
patent: D264196 (1982-05-01), Doggart
patent: D274992 (1984-08-01), Levin
Heathkit, 1977, p. 38, Speaker #AS-1363, located in the upper right corner.

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