Keithley Instruments.
George James Burch
Fernand Charron
Unknown Author
W. E. Ayrton
Aurel Hartwich
Theodor Wulf
Roelof Johan Ritsma
John G. McKendrick
Sir John Cunningham McLennan
Willem Einthoven
J. T. Bottomley
Andreas Hendrikus Johannes Hugen
American Society of Tool and Manufacturing Engineers.
Kenneth Orville Smith
Paul Le Roy Betz
Robert Edward Watson
Julianus Johannes van Zolingen