Url https://edisondigital.rutgers.edu/document/NM003028 Resource class dctype:Text Title [NM003028], Technical Note, Thomas Alva Edison, July 20th, 1872 Creator Edison, Thomas Alva Subject Escapement and governor mechanisms Telegraph Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1872-07-20 Type Technical Note Identifier NM003028 Source 5:540 Rights Thomas Edison National Historical Park Date Created 1872-07-20 Has Version https://archive.org/details/edisonmicrofilm5/page/n548/mode/1up Archive.org Viewer, Microfilm Series Reel 5 Is Part Of NM003-F Uri https://edisondigital.rutgers.edu/document/NM003028 https://edisondigital.rutgers.edu/document/NM003028 --