Soil test kit

Details Soil test kit Soil test kit

1991-10-25

1994-05-24

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Chemical

D10 46

Patent

active

D03471888

REFERENCES:
patent: D251114 (1979-02-01), Potts
patent: D308833 (1990-06-01), Mowka, Jr.
patent: D361826 (1991-05-01), Neuman
patent: 3381572 (1968-05-01), Tuwiner
patent: 4738538 (1988-04-01), Hearst

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