Url https://edisondigital.rutgers.edu/document/PT005C1 Resource class dctype:Text Title [PT005C1], Patent Specification, Thomas Alva Edison, April 22nd, 1873 Creator Edison, Thomas Alva Subject Multiple telegraphy (duplex, quadruplex) Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1873-04-22 Type Patent Specification Identifier PT005C1 Source 8:607 Relation Munn & Co Rights Thomas Edison National Historical Park Date Created 1873-04-22 Has Version https://archive.org/details/edisonmicrofilm8/page/n615/mode/1up Archive.org Viewer, Microfilm Series Reel 8 Is Part Of PT005C-F Uri https://edisondigital.rutgers.edu/document/PT005C1 https://edisondigital.rutgers.edu/document/PT005C1 --