Items

• [D8952AAL], Letter from H P McIntosh to West Orange Laboratory, January 29th, 1889
  1889-01-29
• [D8952ABL], Letter from Canadian Copper Co, H P McIntosh to Thomas Alva Edison, April 10th, 1889
  1889-04-10
• [D8952ABX], Letter from H P McIntosh, Canadian Copper Co to Thomas Alva Edison, September 12th, 1889
  1889-09-12
• [D9047AAA], Letter from Canadian Copper Co, H P McIntosh to Thomas Alva Edison, January 4th, 1890
  1890-01-04
• [D9047AAC], Letter from Canadian Copper Co, H P McIntosh to Thomas Alva Edison, January 27th, 1890
  1890-01-27
• [D9047AAH], Letter from H P McIntosh, Canadian Copper Co to Thomas Alva Edison, January 31st, 1890
  1890-01-31
• [D9060AAI], Telegram from H P McIntosh to Thomas Alva Edison, February 3rd, 1890
  1890-02-03
• [D9137AAC], Letter from H P McIntosh, Canadian Copper Co to Thomas Alva Edison, March 17th, 1891
  1891-03-17