[QD012B0060], Legal Testimony, George Frederick Barker, October 19th, 1889
[QD012B-F] Litigation Series -- Printed Court Records -- Edison Electric Light Company v. United States Electric Lighting Company(1885-1892)
https://edisondigital.rutgers.edu/document/QD012B0060
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Archive.org Viewer, Microfilm Series Reel 46