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Several patent infringement suits detail work by Edison and his assistants, particularly chemist Jonas Walter Aylsworth, on phonograph and recording cylinder technology. One major suit, American Graphophone Company v. Edison Phonograph Works, involved the basic phonograph patents of Edison and of Chichester A. Bell and Charles S. Tainter. That case was entered into evidence in American Graphophone Company v. United States Phonograph Company, Victor E. Emerson, and George E. Tewksbury. Both Edison's side of the original case and his testimony from the later case have been selected. A number of other important suits between the American Graphophone Co. and Edison's National Phonograph Co. dealing with recording cylinder technology have been selected. Additional material can be found in an interference proceeding involving Edison and Thomas Lambert. There are also several suits concerning Edison's phonograph business. The most significant of these, New York Phonograph Company v. National Phonograph Company, has been selected. In addition, a book of exhibits in the case of Thomas A. Edison v. John R. Hardin, Receiver of the North American Phonograph Co. has been selected. Courtesy of Thomas Edison National Historical Park.