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Category:Message systems

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A 1916 photo of British officials using Morse Code at The Battle of Somme
A 1916 photo of British officials using Morse Code at The Battle of Somme

Includes postal services and voice mail.

Subcategories

  • Postal services - the services used to transmit physical objects and tangible letters across space

Subcategories

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Pages in category "Message systems"

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Media in category "Message systems"

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