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Prussian semaphore system

telegraphic communications system used between Berlin and the Rhine Province from 1832 to 1849

en-GB/ˈpɹʌʃn ˈsɛməfɔːɹ ˈsɪstəm/
en-US/ˈpɹʌʃən ˈsɛməˌfoʊɹ ˈsɪstəm/

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semaphore lineorganizationcommunications system