This letterbook covers the period March-June 1892. Most of the letters are by Alfred O. Tate. There is also correspondence by Edison and Thomas Maguire. Many of the letters relate to the phonograph and to legal and financial dealings among the various phonograph companies. Beginning on page 131 is a two-page letter from Edison to George E. Gouraud comparing the phonograph business in the United States and Europe and alluding to Edison's takeover of the North American Phonograph Co. There are also letters referring to the formation of the General Electric Co. and to Edison's sale of his stock in the Edison General Electric Co. Other documents deal with mining and ore milling, electric motors, and the kinetoscope. There are numerous letters to Edison's attorney, Sherburne B. Eaton, and to the firm of Dyer & Seely regarding patent interferences and other litigation in which Edison was involved, as well as additional patent-related matters. Included also are letters pertaining to the development of an underground telegraph cable for the Pennsylvania Railroad and to the installation of a sprinkler system at the West Orange laboratory. The front cover is marked "1892." The spine is stamped "Letters" and is labeled "1892 Mar 9 June 16." The book contains 700 numbered pages and an index. Approximately 20 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.