Audible signal for alarm units

Details Audible signal for alarm units Audible signal for alarm units

1998-01-21

1999-02-02

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04050223

REFERENCES:
patent: D201593 (1965-07-01), Stevenson
patent: D264196 (1982-05-01), Doggart
patent: D339544 (1993-09-01), Sone
patent: 2984832 (1961-05-01), Gilman, III et al.

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