Soil moisture soil indicator

Details Soil moisture soil indicator Soil moisture soil indicator

1977-09-06

1980-06-10

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Temperature, humidity, atmospheric condition

D1004

Patent

active

D02553341

REFERENCES:
patent: D143432 (1946-01-01), Lawrence
patent: D176972 (1956-02-01), Bennett
patent: D245585 (1977-08-01), Bru
patent: 3019638 (1962-02-01), Klein
patent: 3117442 (1964-01-01), Brooks
patent: 3824844 (1974-07-01), Strickland
patent: 3881873 (1975-05-01), Klowden
patent: 3951098 (1976-04-01), Meyers

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