This folder contains material pertaining to two suits brought by the National Phonograph Co. and the Edison Phonograph Co. against the Lambert Co. and Thomas B. Lambert in the U.S. Circuit Court for the Northern District of Illinois, Northern Division. The cases were both initiated in December 1900 and involved Edison's U.S. Patents 414,761, 382,418, and 382,462 on phonograph record blanks. Together, these cases were also known as the "tapered bore case." The selected items consist of the following portions of the complainant's printed record: index, bills of complaint, and testimony of Edison.