Items

• [D7618O], Letter from Thomas Alva Edison to William Orton, April 1876
  1876-04-00
• [NM008037], Technical Note, Thomas Alva Edison, 1873
  1873-00-00
• [NSUN05C], Technical Note, Thomas Alva Edison, November 1873
  1873-11-00
• [SB1677126A], Letter from Jarvis Borsted Edson to Edison and Murray, June 13th, 1874
  1874-06-13