Audible signal for alarm units

Details Audible signal for alarm units Audible signal for alarm units

1995-03-10

1997-04-08

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03787460

REFERENCES:
patent: D350705 (1994-10-01), Sone
patent: 2984832 (1961-05-01), Gilman, III et al.
patent: 3251056 (1966-05-01), Doggart
patent: 4075626 (1978-02-01), Sakaguchi et al.
patent: 4115770 (1978-09-01), Kanazawa
patent: 4366472 (1982-12-01), Ishii

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