National Museum of Nuclear Science & History
O. L. Koch worked for the Midwest Piping and Supply Company.
Alfred Pfanstiehl was a junior physicist at the Chicago Met Lab during the Manhattan Project. Pfanstiehl was a signatory of the Szilard Petition, an attempt to avert military use of the atomic bomb against Japan.
H. R. Olson worked for the J.A. Jones Construction Company.
