transmission of messages

Broader Term: communication9 Documents

Scope Note

This category is used for to index information on the technologically simple transmission of messages. The category includes information on signaling devices (e.g., fire, smoke, blinker, semaphore); signal codes (e.g., drum language, flag codes, Morse code); cryptography; use of carrier birds and animals; messenger and human courier systems; etc. For information on specific methods of transmission use "Mail" (205), "Telephone and Telegraph" (206), "Radio and Television" (207), and "Internet Communications" (2010).

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