This folder contains correspondence and other documents relating to the technical and commercial development of the phonograph. Included is a letter from the New England Phonograph Co. inquiring about the National Phonograph Co. and about the development of a new "home" phonograph. There are also letters from the law firm of Eaton & Lewis regarding payment for their services in a lawsuit between Edison and Ezra T. Gilliland.

The following documents have not been selected: 4 non-substantive letters pertaining to routine legal and contract matters; duplicate copies of selected items.

Courtesy of Thomas Edison National Historical Park.