Accessibility and Availability Notice for PDF Content
The PDF documents previously linked on this page are no longer maintained and may not meet accessibility standards. To request an accessible version of any content, please contact us.
Company Details
American District Telegraph Company
This company was incorporated in New York in May 1872 by Gold and Stock Telegraph Company investors to exploit the district telegraph system invented by Edward Calahan, who had also invented the Gold and Stock ticker. Edison's first caveat for improvements in district telegraphy and an unsuccessful patent application were both assigned to this company.