Url https://edisondigital.rutgers.edu/document/D7829ZCI Resource class dctype:Text Title [D7829ZCI], Letter from Paul Oeker to Thomas Alva Edison, July 1st, 1878 Creator Oeker, Paul Subject Expositions, demonstrations, lectures Microphone and other acoustic devices Cylinder phonograph Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1878-07-01 Type Letter Identifier D7829ZCI Source 18:1032 Rights Thomas Edison National Historical Park Date Created 1878-07-01 Has Version https://archive.org/details/edisonmicrofilm18/page/n1040/mode/1up Archive.org Viewer, Microfilm Series Reel 18 Is Part Of D7829-F Recipient Edison, Thomas Alva Uri https://edisondigital.rutgers.edu/document/D7829ZCI https://edisondigital.rutgers.edu/document/D7829ZCI --