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History
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Sailor with signal lamp
Sailor with signal lamp
Heliograph
Heliograph
Electric telegraph
Electric telegraph
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Replica of a Chappe telegraph on the Litermont near Nalbach, Germany
Replica of a Chappe telegraph on the Litermont near Nalbach, Germany
Great Wall of China
Great Wall of China
Cooke and Wheatstone's five-needle, six-wire telegraph (1837)
Cooke and Wheatstone's five-needle, six-wire telegraph (1837)
A Morse key (c. 1900)
A Morse key (c. 1900)