This letterbook covers the period October-December 1891. Most of the letters are by Alfred O. Tate and Thomas Maguire. There is also correspondence by Edison. Many of the letters relate to the manufacture and marketing of phonographs and cylinder recordings. There is considerable discussion of the packaging of cylinders. Other letters deal with the development of wire-insulating compounds for the Edison General Electric Co. and the ordering of a motor from that company. Included also are financial statements for the Edison Manufacturing Co. and numerous letters, many addressed to the firm of Dyer & Seely, regarding domestic and foreign patents. In addition, there are letters concerning mining and ore milling, electric traction systems, and the testing of storage batteries at the West Orange laboratory. Appearing on pages 578 and 663 is a list of Edison's inventions for 1891. The spine is labeled "General" and "From Oct. 31, 1891. To Dec. 31, 1891." The book contains 695 pages and an index. Approximately 20 percent of the book has been selected. Related documents for this time period can be found in LB-051 and LB-053.