Items

• [N037045], Letter from Thomas Alva Edison to Engineering, July 7th, 1879
  1879-07-07
• [NM001137A], Technical Note, Thomas Alva Edison, October 10th, 1873
  1873-10-10
• [SB508044A1], Interview, Louis Alan Hazeltine, December 1923
  1923-12-00