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La crearon los sumerios a finales del IV milenio a. C.
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Martín Cooper, inventor.
3 de abril de 1973 -
John Logie Baird, inventor.
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Guglielmo Marconi
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Joseph Henry.El primero se utilizó en 1837
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Mayas, siglo III a. C.
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Egipcios, siglo IV
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