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These documents cover the years 1877-1918, with most of the items dating from 1877-1901. They consist of correspondence, circulars, newspaper articles, legal documents, and other material relating primarily to Edison's telegraph and telephone inventions. The documents are arranged in the following order: (1) Exhibitions and Demonstrations; (2) Experiments and Inventions; (3) Patents; (4) Miscellaneous. Courtesy of the AT&T Archives and History Center.