[PT032ABB], Patent Application, Thomas Alva Edison, June 30th, 1888
Removable phonograms—separate recorder/reproducer. Filed 7 July.
Cylinder record and duplicating technology
[PT032ABB-F] Patent Series -- Patent Application Files
https://edisondigital.rutgers.edu/document/PT032ABB
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Archive.org Viewer, Microfilm Series Reel 114