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Optical telegraph - Wikipedia
Semaphore line - Simple English Wikipedia, the free encyclopedia
Semaphore - Wikipedia
烽火 - 维基百科,自由的百科全书
How Napoleon's semaphore telegraph changed the world - BBC
Semaphore Line | Encyclopedia MDPI
Optical communication - Wikipedia
Semaphore | Signaling, Telegraphy, Flags | Britannica
Semaphore Telegraph | Encyclopedia MDPI
Napoleonic Telecommunications: The Chappe Semaphore Telegraph