This folder contains correspondence relating to the technical and commercial development of the telegraph. Some of the letters are from the law firm of Eaton & Lewis and concern the case of Welch v. Edison. Other letters pertain to quadruplex patent royalties. Also included is a letter from Stephen Vail (son of Alfred Vail, the co-inventor of the telegraph) offering an original telegraph receiver for sale.

All of the documents have been selected.

Courtesy of Thomas Edison National Historical Park.