Joseph H. Cummins

C. H. Hutchinson

C. H. Hutchinson worked for the Roane-Anderson Company.

Paul J. Esterline

Paul J. Esterline was an engineer. He attended Ohio State University for two years, and then attended the Chicago Technical Institute in the late 1920s, learned engineering drafting there.

Lawrence B. Magnusson

Lawrence B. Magnusson was a research associate at the Metallurgical Laboratory at the University of Chicago.

Herbert S. Glick