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History
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An ancient hydraulic telegraph being used by Aeneas to send a message.
An ancient hydraulic telegraph being used by Aeneas to send a message.
Reconstruction, Thessaloniki Science Center and Technology Museum
Reconstruction, Thessaloniki Science Center and Technology Museum
Reconstructed model, messages attached to rod, Thessaloniki Science Center and Technology Museum
Reconstructed model, messages attached to rod, Thessaloniki Science Center and Technology Museum
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Sailor with signal lamp
Sailor with signal lamp
Heliograph
Heliograph
Electric telegraph
Electric telegraph