Items

• [D7826ZHL], Letter from Thomas Alva Edison to Stockton L Griffin, 1878
  1878-00-00
• [D7905N], Letter from H W Thomson to Thomas Alva Edison, July 17th, 1879
  1879-07-17
• [MBN004060A], Technical Note, Charles Batchelor, August 1st, 1879
  1879-08-01