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Optical telegraph - Wikipedia
Semaphore line - Simple English Wikipedia, the free encyclopedia
Semaphore - Wikipedia
Semaphore Line | Encyclopedia MDPI
Optical communication - Wikipedia
Semaphore | Signaling, Telegraphy, Flags | Britannica
Semaphore Telegraph | Encyclopedia MDPI
How Napoleon's semaphore telegraph changed the world - BBC
The Optical Telegraph: Faster than a Messenger on Horseback
Semaphore line - Infogalactic: the planetary knowledge core