09/13/1875 Batchelor, Charles to Batchelor, Thomas Hatch
Sales and service; Patent assignments, licenses, and royalties; Electric pen and mimeograph
[MBLB1]  Special Collections Series -- Charles Batchelor Collection -- Letterbooks: Cat. 1238 (1875-1878)
[MBLB1018; TAEM 93:32]
Courtesy of Thomas Edison National Historical Park.