Howard T. Parr

W.S. Hulet

W. Maddox

W. Maddox worked in the shop at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

J. R. Siebert

J. R. Siebert worked for the Comstock-Bryant Electric Company.

I. E. Martin

I. E. Martin worked for the Union Carbide & Carbon Corporation.