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The invention of the first writing systems is roughly contemporary with the beginning of the Bronze Age. The first writing system is generally believed to have been invented in pre-historic Sumer and developed by the late 3000's BC into cuneiform. Egyptian hieroglyphs, and the undeciphered Proto-Elamite writing system and Indus Valley script also date to this era, though a few scholars have questioned the Indus Valley script's status as a writing system.
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1792 – Claude Chappe establishes the first long-distance semaphore telegraph line.
1831 – Joseph Henry proposes and builds an electric telegraph.
1836 – Samuel Morse develops the Morse code.
1843 – Samuel Morse builds the first long distance electric telegraph line.
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1947 – Douglas H. Ring and W. Rae Young of Bell Labs propose a cell-based approach which led to "cellular phones."
1981 – Nordic Mobile Telephone, the world's first automatic mobile phone is put into operation
1991 – GSM is put into operation
1992 – Neil Papworth sends the first SMS (or text message).
1999 – 45% of Australians have a mobile phone.
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On 11 September 1940, George Stibitz transmitted problems for his Complex Number Calculator in New York using a teletype, and received the computed results back at Dartmouth College in New Hampshire.[34] This configuration of a centralized computer (mainframe) with remote dumb terminals remained popular well into the 1970s.
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