Título: Morse Telegraph 1837, Morse Telegraph (1837), historical collection of France Telecom, Telecommunication City in Pleumeur-Bodou, France.
Fonte: https://en.wikipedia.org/wiki/Electrical_telegraph#/media/File:Morse_Telegraph_1837.jpg
Licença: https://creativecommons.org/licenses/by-sa/3.0/
24-05-1844