This folder contains correspondence about the technical and commercial development of the telephone in the United States and abroad. Some of the letters pertain to the organization of a telephone company in Great Britain. Also included are requests for information about the telephone and correspondence about the loan of a loud-speaking telephone for a lecture series.

Approximately 50 percent of the documents have been selected. The following documents have not been selected: printed invitation to the tenth annual meeting of the National Telephone Exchange; royalty statements from the American Bell Telephone Co.; printed form from the American Cushman Telephone Co.