Url https://edisondigital.rutgers.edu/document/PT5137 Resource class dctype:Text Title [PT5137], Patent Application, Thomas Alva Edison, April 28th, 1925 Creator Edison, Thomas Alva Subject Disc phonograph Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1925-04-28 Type Patent Application Identifier PT5137 Source 247:683 Rights Thomas Edison National Historical Park Date Created 1925-04-28 Has Version https://archive.org/details/edisonmicrofilm247/page/n692/mode/1up Archive.org Viewer, Microfilm Series Reel 247 Is Part Of PT5137-F Uri https://edisondigital.rutgers.edu/document/PT5137 https://edisondigital.rutgers.edu/document/PT5137 --