Url https://edisondigital.rutgers.edu/document/QB001AAP Resource class dctype:Text Title [QB001AAP], Letter from Frank Lewis Dyer to August Hagelin, April 20th, 1906 Creator Dyer, Frank Lewis Subject Competition and market structure Patent and legal counsel Electric battery Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1906-04-20 Type Letter Identifier QB001AAP Source 222:685 Relation Kolner Akkumulatoren Werke Gottfried Hagen Sweden. Patent Office Jungner, Ernest Waldemar Hultman, J Ad Edison, Thomas Alva Rights Thomas Edison National Historical Park Date Created 1906-04-20 Has Version https://archive.org/details/edisonmicrofilm222/page/n694/mode/1up Archive.org Viewer, Microfilm Series Reel 222 Is Part Of QB001-F Recipient Hagelin, August Uri https://edisondigital.rutgers.edu/document/QB001AAP https://edisondigital.rutgers.edu/document/QB001AAP --