CARLI Digital Collections
Century of Progress World's Fair, 1933-1934 (University of Illinois at Chicago)
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"Here are shown the two ten ton Frigidaire condensing units which provide a change of air every two minutes in the Electric Light and Power Industry's puppet theater on the second floor of the Electrical Building at the World's Fair. The complete process of the air-cooling unit in operation is also on display at the exhibit."
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