[LB056186], Letter from Thomas Alva Edison to Harkness Fire Extinguisher Co, March 26th, 1892
https://edisondigital.rutgers.edu/document/LB056186
Transcription
March 26, 1892 Harkness Vice Extinguisher Co., No. 77 East Houston Street, New York City. Dear Sirs:- I would be obliged if you will kindly send a representative to the Laboratory for consultation in regard to sprinkler equipment. When he calls please have him ask for Mr. John Ott. Yours truly, Thomas A. Edison M.