Items

Items

• 

  [E1536BJ], Letter from Betts and Betts Corp, Harry A Yerkes to Thomas Alva Edison, October 25th, 1915

  1915-10-25
• 

  [E1536BL], Letter from Betts and Betts Corp, Louis Heugerer to West Orange Laboratory, November 11th, 1915

  1915-11-11
• 

  [E1565QJ], Letter from Harry A Yerkes, Betts and Betts Corp to Thomas Alva Edison, December 9th, 1915

  1915-12-09