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  1. Optical telegraph - Wikipedia

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

  3. Semaphore - Wikipedia

  4. Semaphore Line | Encyclopedia MDPI

  5. Optical communication - Wikipedia

  6. Semaphore | Signaling, Telegraphy, Flags | Britannica

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

  8. Semaphore Telegraph | Encyclopedia MDPI

  9. Semaphore: The World’s First Telegraph - Amusing Planet

  10. The Optical Telegraph: Faster than a Messenger on Horseback