This letterbook covers the period February-August 1893. Most of the letters are by Alfred O. Tate. There is also correspondence by Edison and Thomas Maguire. Many of the letters pertain to the business of the Edison Manufacturing Co. and to its relations with the General Electric Co. There is also correspondence dealing with the affairs of the various phonograph companies. Other letters relate to the development of the kinetograph and to Edison's exhibit at the World Columbian Exposition in Chicago. Included also are letters concerning mining and ore milling, batteries and meters, and the phonoplex system. The front cover is marked "1893." The book contains 696 numbered pages and an index. Approximately 15 percent of the book has been selected. Related documents for this time period can be found in LB-053. Courtesy of Thomas Edison National Historical Park.