This folder contains correspondence and other documents relating to foreign and domestic patent applications, patent litigation, and other patent matters. Most of the material consists of letters to Edison from the law firm of Dyer, Edmonds & Dyer pertaining to phonograph patents and patent infringements.

Less than 10 percent of the documents have been selected. The following items have not been selected: non-substantive correspondence about application fees or patent renewals, letters of transmittal, statements of claims allowed, and documents that duplicate information in selected items.