Items

• [NB239] Technical Note, c. 1918
  1918-00-00
• [NB239003], Technical Note, Fehen (Edison Employee), Newman Henry Holland, William Alphonsus Hayes, March 1918
  1918-03-00
• [NB239007], Technical Note, William Alphonsus Hayes, Fehen (Edison Employee), April 1918
  1918-04-00
• [NB239013], Technical Note, William Alphonsus Hayes, Fehen (Edison Employee), May 1918
  1918-05-00
• [NB239016], Technical Note, William Alphonsus Hayes, Fehen (Edison Employee), June 1918
  1918-06-00