Url https://edisondigital.rutgers.edu/document/D7905A Resource class dctype:Text Title [D7905A], Letter from P Chr Madsen to Thomas Alva Edison, February 9th, 1879 Creator Madsen, P Chr Subject Telephone Chemicals, chemical products, and chemical processes Heat and thermodynamics Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1879-02-09 Type Letter Identifier D7905A Source 49:602 Rights Thomas Edison National Historical Park Date Created 1879-02-09 Has Version https://archive.org/details/edisonmicrofilm49/page/n610/mode/1up Archive.org Viewer, Microfilm Series Reel 49 Is Part Of D7905-F Recipient Edison, Thomas Alva Uri https://edisondigital.rutgers.edu/document/D7905A https://edisondigital.rutgers.edu/document/D7905A --