[PT032AGR], Patent Application, Thomas Alva Edison, January 16th, 1905
Cylinder recording & reproducing apparatus
[PT032AGR-F] Patent Series -- Patent Application Files
https://edisondigital.rutgers.edu/document/PT032AGR
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Archive.org Viewer, Microfilm Series Reel 184