[LB040446], Letter from Thomas Alva Edison to New Jersey and Pennsylvania Concentrating Works, P F Gildea, May 9th, 1890
https://edisondigital.rutgers.edu/document/LB040446
Transcription
May 9, 1890 P.F. Gildea, Esq., Sup't N.J. & Pa., Concentrating Works, Bechtelsville, Pa. Dear Sir:- When you ship the bit, please notify the American Rock Diamond Boring Co,, so that they may know from whom it comes, and understand what action to take. Yours very truly, Thos A. Edison