Philadelphia Electric Company, Philadelphia, PA.
Pennsylvania Power & Light Company, Allentown, PA.
Delmarva Power Company, Newark, DE.
Public Service Gas & Electric Company, Newark, NJ.
Consolidated Railroad Company, Philadelphia, PA.
Sears Roebuck & Company, Chicago, Il.
Electronics Associates Inc., Princeton, NJ.
Electrical Safety for the University of PA., Philadelphia, PA.
Gilbert Associates, Reading, PA.
ECON Inc., Princeton, NJ.
Argonne National Laboratory, Argonne, Il.
Levitan Electrical Equipment, Inc., Long Island, NY.
Wolf, Block, Schorr and Solis-Cohn, Philadelphia, PA.
Houghton Mifflin Publishing Company, Boston, MA.