Items

• [LB032128], Letter from Thomas Alva Edison to Harkness Fire Extinguisher Co, August 22nd, 1889
  1889-08-22
• [LB034284], Letter from Alfred Ord Tate to Harkness Fire Extinguisher Co, November 27th, 1889
  1889-11-27
• [LB039280], Letter from West Orange Laboratory to Harkness Fire Extinguisher Co, April 3rd, 1890
  1890-04-03
• [LB041007], Letter from Alfred Ord Tate to Harkness Fire Extinguisher Co, May 13th, 1890
  1890-05-13
• [LB048148], Letter from West Orange Laboratory to Harkness Fire Extinguisher Co, March 6th, 1891
  1891-03-06
• [LB049179], Letter from Thomas Alva Edison to Harkness Fire Extinguisher Co, May 1st, 1891
  1891-05-01
• [LB056186], Letter from Thomas Alva Edison to Harkness Fire Extinguisher Co, March 26th, 1892
  1892-03-26
• [LB056238], Letter from Alfred Ord Tate to Harkness Fire Extinguisher Co, April 5th, 1892
  1892-04-05