Items

• [NA347123], Technical Note, Thomas Alva Edison, September 15th, 1920
  1920-09-15
• [NA347125], Technical Note, Thomas Alva Edison, September 21st, 1920
  1920-09-21
• [NA347135], Technical Note, Thomas Alva Edison, September 22nd, 1920
  1920-09-22
• [NB231069B], Technical Note, John A Hanley, June 25th, 1919
  1919-06-25
• [NB230065], Technical Note, John A Hanley, August 16th, 1918
  1918-08-16
• [NB244031], Technical Note, Ludwig Fredrick Ott, July 3rd, 1920
  1920-07-03
• [NP120039], Diary, Thomas Alva Edison, October 31st, 1919
  1919-10-31