Url https://edisondigital.rutgers.edu/document/NB263195 Resource class dctype:Text Title [NB263195], Technical Note, George Edwin Hart, June 4th, 1921 Creator Hart, George Edwin Subject Disc record and duplicating technology Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1921-06-04 Type Technical Note Identifier NB263195 Source 241:1010 Rights Thomas Edison National Historical Park Date Created 1921-06-04 Has Version https://archive.org/details/edisonmicrofilm241/page/n1021/mode/1up Archive.org Viewer, Microfilm Series Reel 241 Is Part Of NB263-F Uri https://edisondigital.rutgers.edu/document/NB263195 https://edisondigital.rutgers.edu/document/NB263195 --