National Museum of Nuclear Science & History
Richard Apple was a research associate at the University of Chicago’s Metallurgical Laboratory during the Manhattan Project.
C. E. Winters worked for the United States Engineer District Office.
Daniel D. Friel was a chemical engineer for the DuPont Company who joined the Manhattan Project at the University of Chicago in 1943.
R. R. Wischmeyer worked for the Midwest Piping and Supply Company.