Moisture and light meter for plant life

Details Moisture and light meter for plant life Moisture and light meter for plant life

1976-02-05

1978-02-07

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Temperature, humidity, atmospheric condition

D1004

Patent

active

D02471620

REFERENCES:
patent: D176833 (1956-01-01), Wallace
patent: D190096 (1961-04-01), Wayne
patent: D197414 (1964-01-01), Erath
patent: D212124 (1968-08-01), Feldman
patent: D237365 (1975-10-01), Vachtel
patent: 3522732 (1970-08-01), Bauer
patent: 3545273 (1970-12-01), Friberg
Design News, 5/12/65, p. 48, Elec. Hygrometer at right.
House and Garden, 11/74, p. 156, "Plantstalk" at center.

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