University of Illinois at Chicago Century of Progress World's Fair, 1933-1934 (University of Illinois at Chicago)
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"The Sight Meter Demonstration, which is on display as a part of the exhibit of the Electric Light and
1. "The Sight Meter Demonstration, which is on display as a part of the exhibit of the Electric Light and Power Industry on the second floor of the Electrical Building. [The visitor] can test his own eyesight and determine the amount of light necessary for reading matter and household tasks."
   

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