This folder contains correspondence, agreements, and other documents relating to quadruplex telegraphy. Much of this material deals with litigation involving Edison, Western Union, and the Atlantic & Pacific Telegraph Co. Included are many letters by Edison's associate Josiah C. Reiff. Related material can be found in D-80-43 (Telephone -- General).

All of the documents have been selected except for duplicate copies of correspondence.

Courtesy of Thomas Edison National Historical Park.