This folder contains material pertaining to the suit brought by the National Phonograph Co. against the Lambert Co. in the U.S. Circuit Court for the Northern District of Illinois. The case was initiated in December 1902 and involved Edison's U.S. Patent 713,209 on molding records. The selected items consist of correspondence regarding the progress of litigation; a report by Walter H. Miller on a visit to the Lambert factory in Chicago; and portions of the National Phonograph Co.'s brief on appeal to the U.S. Circuit Court of Appeals. A portion of the court record for this case, the Edison v. Lambert interference proceeding, appears in Thomas A. Edison Papers, Part III (1887-1898).