Items

• [CK602AGP], Letter from Richard Wesley Kellow to G M Ryder, August 30th, 1920
  1920-08-30
• [CK603AAL], Letter from Frank Powers to Henry Augustus Altengarten, August 11th, 1921
  1921-08-11
• [CK603AAU], Letter from E N Goodman to Frank Ross Blair, May 25th, 1923
  1923-05-25
• [CK619AAP], Letter from Henry Augustus Altengarten to Thomas Alva Edison, September 6th, 1921
  1921-09-06
• [CK619AAQ], Letter from Henry Augustus Altengarten to Thomas Alva Edison, December 1st, 1921
  1921-12-01
• [CK619AAR], Letter from Henry Augustus Altengarten to Thomas Alva Edison, December 9th, 1921
  1921-12-09
• [CK619AAT], Letter from Henry Augustus Altengarten to Thomas Alva Edison, December 13th, 1921
  1921-12-13
• [CK619AAW], Letter from Henry Augustus Altengarten to W M Sheldon, December 27th, 1921
  1921-12-27
• [CK619AAX], Letter from Henry Augustus Altengarten to Thomas Alva Edison, January 2nd, 1922
  1922-01-02
• [CK620ABX], Letter from Henry Augustus Altengarten to Thomas Alva Edison, April 5th, 1922
  1922-04-05
• [NA287AAA], Technical Note, Thomas Alva Edison, July 24th, 1918
  1918-07-24
• [NA299037], Technical Note, Thomas Alva Edison, May 17th, 1920
  1920-05-17
• [NB244057], Technical Note, Ludwig Fredrick Ott, September 2nd, 1920
  1920-09-02
• [NP121005] Diary, 1919-1920
  1919-1920
• [NP121022] Diary, 1919-1920
  1919-1920