Items

• [CJ619AAQ], Letter from John E Helm, Helm and Knight to Harry Frederick Miller, February 16th, 1910
  1910-02-16
• [D0817AAF], Letter from Helm and Knight to Thomas Alva Edison, September 22nd, 1908
  1908-09-22
• [D0833AAH], Letter from John E Helm, Helm and Knight to Harry Frederick Miller, December 12th, 1908
  1908-12-12
• [D0932AAF], Letter from Helm and Knight to Frank Lewis Dyer, February 5th, 1909
  1909-02-05