Items

• [D7905N], Letter from H W Thomson to Thomas Alva Edison, July 17th, 1879
  1879-07-17
• [MB290], Reminiscence, Charles Batchelor, 1905
  1905-00-00
• [MBN004010], Technical Note, Charles Batchelor, December 18th, 1878
  1878-12-18
• [MBN004060A], Technical Note, Charles Batchelor, August 1st, 1879
  1879-08-01
• [N001025], Technical Note, Charles Batchelor, Thomas Alva Edison, December 15th, 1878
  1878-12-15
• [N052093] Technical Note, October 21st, 1879
  1879-10-21