Items

• [D7501H], Letter from Charles H Graef to Thomas Alva Edison, October 21st, 1875
  1875-10-21
• [D7518E], Letter from Charles H Graef to Edison and Murray, April 23rd, 1875
  1875-04-23
• [D7826ZAA], Letter from Charles H Graef to Thomas Alva Edison, March 23rd, 1878
  1878-03-23