Door annunciator housing

Details Door annunciator housing Door annunciator housing

1979-02-05

1981-10-06

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D1005

Patent

active

D02611171

REFERENCES:
patent: 3284797 (1966-11-01), Roswell

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