Sump pump failure alarm

Details Sump pump failure alarm Sump pump failure alarm

1994-03-14

1994-12-20

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03535487

REFERENCES:
patent: D194293 (1962-12-01), Sullivan
patent: D311703 (1990-10-01), Kern
patent: 4369438 (1983-01-01), Wilhelmi
patent: 4377809 (1983-03-01), Lawford
patent: 4456432 (1984-06-01), Mannino

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