Semaphore Telegraph

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Semaphore Telegraph



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  • Coe, Lewis. The Telegraph: A History of Morse's Invention and Its Predecessors in the United States. Jefferson, NC: McFarland & Company, Inc., Publishers, 1993.
  • Holzmann, Gerard J. The Early History of Data Networks.
  • Lubrano, Annteresa. The Telegraph: How Technology Innovation Caused Social Change.
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  • Shiers, George. The Electric Telegraph: An Historical Anthology.