This folder contains correspondence, agreements, and other documents relating to the telephone in the United States and abroad. Some of the documents pertain to patent rights. Other documents concern technical improvements made by Edison and Ezra T. Gilliland.
Approximately 80 percent of the documents have been selected. The following categories of documents have not been selected: routine correspondence concerning orders for carbon buttons; receipts; duplicate copies of selected documents. Courtesy of Thomas Edison National Historical Park.