The company started in the temperature-controls business in 1885, two years after its founder, Warren S. Johnson, a professor at the State Normal School in Whitewater, Wisconsin, received a patent for the electric room thermostat.

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All restrictions for the district's roughly 2, 200 students were called off about 1 p.m. after state troopers called school officials and said that operations could return to normal, according to McDonald.

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