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