Annunciator

Details Annunciator Annunciator

1980-04-14

1982-08-17

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D10106, D1006

Patent

active

D02658020

REFERENCES:
patent: 3892930 (1975-07-01), Wieder
Hardware Age, 8-1975, p. 174, Burglar/Fire Alarm.

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