Thermochromic thermometer

Details Thermochromic thermometer Thermochromic thermometer

1977-03-28

1979-01-16

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Temperature, humidity, atmospheric condition

D1004

Patent

active

D02508117

REFERENCES:
patent: 2579738 (1951-12-01), Hargraves
patent: 2706761 (1955-04-01), Douglas
Popular Science-1/76-p. 73-LC pocket pyrometer at center-2nd from left.

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