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  1. Optical telegraph - Wikipedia

  2. Semaphore line - Simple English Wikipedia, the free encyclopedia

  3. Semaphore - Wikipedia

  4. 烽火 - 维基百科,自由的百科全书

  5. How Napoleon's semaphore telegraph changed the world - BBC

  6. Semaphore Line | Encyclopedia MDPI

  7. Optical communication - Wikipedia

  8. Semaphore | Signaling, Telegraphy, Flags | Britannica

  9. Semaphore Telegraph | Encyclopedia MDPI

  10. Napoleonic Telecommunications: The Chappe Semaphore Telegraph