Water detector

Details Water detector Water detector

1978-06-19

1980-09-09

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D1005

Patent

active

D02567873

REFERENCES:
patent: D153846 (1949-05-01), Beckstrom
patent: D192275 (1962-02-01), Herscovitz
patent: D238237 (1975-12-01), Herlow
patent: 2554627 (1951-05-01), Merola
patent: 2936616 (1960-05-01), Benbow
patent: 3186224 (1965-06-01), Mair
patent: 3986110 (1976-10-01), Overall
patent: 4050995 (1977-09-01), Bredeweg
patent: 4160374 (1979-07-01), Crump

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