Items

• [D7213A], Agreement, Thomas Alva Edison, William Unger, July 3rd, 1872
  1872-07-03
• [D7401C2], Bill/Receipt from William Unger to Thomas Alva Edison, December 24th, 1874
  1874-12-24
• [D7405D], Letter from William Unger to Thomas Alva Edison, July 12th, 1874
  1874-07-12
• [NM001070], Technical Note, Thomas Alva Edison, William Unger, July 23rd, 1870
  1870-07-23