Audible signal for alarm units

Details Audible signal for alarm units Audible signal for alarm units

1992-08-31

1994-09-20

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03507050

REFERENCES:
patent: D201593 (1965-07-01), Stevenson
patent: D264196 (1982-05-01), Doggart
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: 4303908 (1981-12-01), Enemark et al.
patent: 4366472 (1982-12-01), Ishii

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