[LB050279A], Letter from Thomas Alva Edison to North American Co, July 7th, 1891
https://edisondigital.rutgers.edu/document/LB050279A
Transcription
July 7th, 1891. Dear Sirs:-- I beg to hand you herewith bills for experiments conducted in my Laboratory in your behalf from October 1890 to May 1891, both inclusive, amounting to $11,678.60, which have been prepared in accordance with the terms of the contract between yourselves and me, under date of October 1st, 1890. Yours very truly, Thos A Edison