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Cavemen gathered around fire to discuss day to day activities.

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Cavemen started inscribing on caves.

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Used by tribes of North America and Ancient China.
It's used to alert danger communication.

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Extensively used for long disttance communication.
It was used by Greeks, Persians and Romans.

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Used in mid 19th century between East Coast and West Coast of America.

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Communication using visual signals with hand-held flags, rods and disk.
It was used in maritime during the late 19th century.

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Harnessing of electricity gave birth to electric telegraphy.
Telegraphy was the most popular form of long distance communication.

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Beginning of a new era of distant communication.
20th century: radio system was used to play music and voice.

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Used for diplomatic purpose or broadcasting.
Created by Alexander Graham Bell in 1876, only rich people could afford. However, after that, the telephone became a global form of communication.