[PT032AGG], Patent Application, Thomas Alva Edison, November 11th, 1903
Cellulose, resins, rubber, and related products
Cylinder recording & reproducing apparatus
[PT032AGG-F] Patent Series -- Patent Application Files
https://edisondigital.rutgers.edu/document/PT032AGG
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Archive.org Viewer, Microfilm Series Reel 184