Combined water sensor and alarm apparatus

Details Combined water sensor and alarm apparatus Combined water sensor and alarm apparatus

1980-01-16

1981-11-24

Word, A. Hugo

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D1005

Patent

active

D02619989

REFERENCES:
patent: 3440396 (1969-04-01), Greene, Jr.
patent: 3874403 (1975-04-01), Fischer
patent: 4001531 (1977-01-01), Crockett, Sr.
patent: 4080593 (1978-03-01), Gernandt et al.

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