A. H. Femmel

R. A. Lindeman

George Francis McEwen

​George Francis McEwen was born on June 16, 1882 in Manchester, Iowa. He attended Iowa State College.

H. E. Donachy

H. E. Donachy worked for the Edenfield Electric Company.

Fred H. Vogel

Fred Vogel was an American chemical engineer who worked at Los Alamos during the Manhattan Project. Vogel studied at Lehigh University in Pennsylvania and later worked as Chief Engineer for the Cornell Machine Company and for the Centaur Machine Company.