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Two Men with A-C Network Calculator, Illinois Institute of Technology, ca. 1951
W.C. Jacobs and J.M. Brager of Consumer Powers Company with A-C Network Calculator, Illinois Institute of Technology, 1951
Electrical Engineering handheld scanning device, Illinois Institute of Technology, Chicago, Illinois, 1980s
A-C Network Calculator, inside mechanics, Illinois Institute of Technology, Chicago, Illinois, 1945