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Edison's technical work on motion pictures resulted in a major patent infringement suit filed in 1898 on Edison's U.S. Patent No. 589,168. Testimony and exhibits from Thomas A. Edison v. American Mutoscope Company and Benjamin F. Keith were often entered into evidence in subsequent infringement cases brought by Edison and his companies on this patent and its reissue, No. 12,192. The record from Edison's side of the case, which provides information concerning early work on motion pictures undertaken at the West Orange laboratory, has been selected in its entirety. Additional items from two of the cases involving the reissued patent have also been selected: (1) Edison's deposition from Edison Manufacturing Company v. Kleine Optical Company; and (2) the testimony of William K. L. Dickson, George Eastman, and Harry N. Marvin from Motion Picture Patents Company v. Chicago Film Exchange. A set of letters to and from Dickson referring to his work for Edison, which was entered into evidence in Armat Moving Picture Company v. American Mutoscope Company and Benjamin F. Keith, has also been selected. Courtesy of Thomas Edison National Historical Park.