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Was developed by Samuel Morse.
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Allowed people to send message using a single cable.
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Was the first person to transmit the voice across a distance using an electrical device, but finally he couldn't patent his invention.
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Pony Express was remplaced by this telegraph
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16 years later he obtained a patent for the telephone.
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It was made by Martin Cooper
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The first commercial mobile phone that arrived in US and Japan,
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The popularitzation of mobile phone began in the 1990s
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The US Congress recognised the true inventor was an unknow Italian immigrant called Antonio Meucci.
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