Copper Development Association.
Austin Vitruvius Eastman
Karl R. Spangenberg
William Alden Edson
Unknown Author
Ludwell Sibley
Dan Torres
Frithiof I. Niordson
C. F. Rockey
Howard W. Sams & Co.
Babcock & Wilcox Company.
Arthur Lemuel Albert
Theodore Soller
Piotr Mikołajczyk
H. Barkhausen
Radio Corporation of America. Electron Tube Division.
G. Parr
Peter Ramins
Menno van der Veen