Items

• [D8220L], Letter from Robert H Engle to Thomas Alva Edison, April 17th, 1882
  1882-04-17
• [D9208AAP], Letter from Robert H Engle to Thomas Alva Edison, November 4th, 1892
  1892-11-04
• [E1805AI], Letter from Robert H Engle to Thomas Alva Edison, September 26th, 1918
  1918-09-26