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A medical mercury-in-glass maximum thermometer showing the temperature of 38.7 °C (101.7 °F). One special kind of mercury-in-glass thermometer, called a maximum thermometer, works by having a constriction in the neck close to the bulb. As the temperature rises, the mercury is pushed up through the constriction by the force of expansion.
Tru-Vue moved at that time from Rock Island, Illinois, to Beaverton, Oregon, [4] near where Sawyer's had built a new plant, and for a few years was a subsidiary company of Sawyer's. [5] Eventually, it became only a brand name. Both View-Master and Tru-Vue products were manufactured into the 1960s by Sawyer's.
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