411 REFERENCE · Wikibooks
Free Knowledge Culture Calendar/March 2
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Télégraphe de Lançon, sud-est.jpg 300 220 156 43 right
Today in 1791 the first semaphore telegraph transmission took place in France on what developed into the Chappe network. It eventually extended over 4,800 km.
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