George R. Barnhart

Arthur A. Jakobiak

H. W. Oldfield

H. W. Oldfield worked for the Roane-Anderson Company.

Donald Engelkemeior

Donald Engelkemeior was a research assistant at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

H. C. Smith

H. C. Smith worked for the United States Engineer District Office.