Url https://edisondigital.rutgers.edu/document/D8939ABB1 Resource class dctype:Text Title [D8939ABB1], Letter from Philip Sidney Dyer to Francis Robbins Upton, April 1889 Creator Dyer, Philip Sidney Subject International business operations Competition and market structure Incandescent lamp Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1889-04-00 Type Letter Identifier D8939ABB1 Source 126:506 Relation Siemens and Halske Compagnie Continentale Edison Rights Thomas Edison National Historical Park Has Version https://archive.org/details/edisonmicrofilm126/page/n515/mode/1up Archive.org Viewer, Microfilm Series Reel 126 Is Part Of D8939-F Recipient Upton, Francis Robbins Uri https://edisondigital.rutgers.edu/document/D8939ABB1 https://edisondigital.rutgers.edu/document/D8939ABB1 --