Url https://edisondigital.rutgers.edu/document/D8123ZFZ Resource class dctype:Text Title [D8123ZFZ], Memorandum, William Joseph Hammer, 1881 Creator Hammer, William Joseph Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1881-00-00 Type Memorandum Identifier D8123ZFZ Source 57:1020 Rights Thomas Edison National Historical Park Has Version https://archive.org/details/edisonmicrofilm57/page/n1030/mode/1up Archive.org Viewer, Microfilm Series Reel 57 Is Part Of D8123-F Uri https://edisondigital.rutgers.edu/document/D8123ZFZ https://edisondigital.rutgers.edu/document/D8123ZFZ --