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Postcard showing the installation of a wireless telegraph station at Camp de Mailly, with several men in uniform around a vehicle and an antenna. The back details the history of military communications, mentioning the Mailly line (near Troyes) in 1874, the Chappe arm machine in 1794, and the invention of the electric telegraph by Morse in 1844, completed by Baudot in 1866. 5c French Republic stamp, cancellation visible.