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Hieroglyphics in Egypt: Early form of written communication.
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Cave paintings and petroglyphs: Early forms of visual communication.
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Greek and Roman communication networks: Development of postal systems and messenger services.
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Printing press: Invention by Johannes Gutenberg revolutionizes mass communication.
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Telegraph: Samuel Morse develops Morse code, enabling long-distance communication.
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Radio: Marconi's wireless telegraphy paves the way for broadcast communication.