Items

• [D8004ZCR], Letter from Thomas Alva Edison to American Machinist, April 15th, 1880
  1880-04-15
• [E1929FP], Letter from Thomas Alva Edison, William Henry Meadowcroft to Electrical Review and Western Electrician, Engineering News, Iron Age, Electrical World, American Machinist, Machinery (Magazine), Industrial Management, Scientific American, American Society of
  1919-10-29
• [LB005847], Letter from Thomas Alva Edison to American Machinist, April 20th, 1880
  1880-04-20