Audible alarm for detecting earthquakes and gas leakage

Details Audible alarm for detecting earthquakes and gas leakage Audible alarm for detecting earthquakes and gas leakage

1991-12-16

1993-10-12

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03402002

REFERENCES:
patent: D297317 (1988-08-01), Taylor
patent: 2345772 (1944-04-01), Robertson et al.
patent: 3144850 (1964-08-01), Rosenberg
patent: 3276004 (1966-09-01), Mayo, Jr.
patent: 3488649 (1970-01-01), Lee
patent: 4488118 (1984-12-01), Jeffers et al.
patent: 4525704 (1985-06-01), Campbell et al.
patent: 4916437 (1990-04-01), Gazzay

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