Url https://edisondigital.rutgers.edu/document/QCE02321 Resource class dctype:Text Title [QCE02321] Letter, January 29th, 1875 Creator Wilber, Zenas Fisk Subject Multiple telegraphy (duplex, quadruplex) Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1875-01-29 Type Letter Identifier QCE02321 Source 10:889 Relation Edison, Thomas Alva Rights Thomas Edison National Historical Park Date Created 1875-01-29 Has Version https://archive.org/details/edisonmicrofilm10/page/n898/mode/1up Archive.org Viewer, Microfilm Series Reel 10 Is Part Of QCE02-F Recipient U.S. Patent Office. Commissioner Uri https://edisondigital.rutgers.edu/document/QCE02321 https://edisondigital.rutgers.edu/document/QCE02321 --