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This material consists of correspondence, court documents, and other items relating to infringement suits, contract disputes, and other legal actions involving Edison's phonograph. Most of the selected items cover the years 1899-1910, but a few case files begin during the mid-1890s and some continue into the 1910s. Approximately half of the cases relate to litigation involving the National Phonograph Co. or other Edison interests and the American Graphophone Co. or its associated sales company, the Columbia Phonograph Co., General. Other cases deal with the disposition of litigation between Edison and the New York Phonograph Co.; the supply of Edison phonographs to Europe; patent infringement by Pathé Frères in France; and Mexican copyright law. In addition, there is a case file containing information concerning price maintenance litigation pursued by the National Phonograph Co. and its affiliates. Closely related cases have been grouped in the same folders.