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1935 - warning system -  Illinois State Penitentiary

FOREWARN SYSTEM

E&MP 94.015

Photo Electric Cells

ca. 1935

Remote Control Case, (interior) [label start] Paul W. Koch & Co. Chicago, ILL. U.S.A. [label end] Illinois State Penitentiary Joliet, Illinois

Original Caption by Science Service
© Illinois State Penitentiary



National Museum of American History

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