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Telegraph, Joseph Henry.
Is used to to send signals over short distances. -
Telephone, Antonio Meucci.
Is used to communicate. -
Radio, Guillermo Marconi
Is used to signaling and communication technology using radio waves. -
Television, John Logie Baird
Is used to show images from a long distance. -
Computer, Konrad Zuse.
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Tablet, Alan Kay
Is a wireless, portable personal computer with a touchscreen interface. -
Mobile phone, Martin Cooper.
Is used to receive calls through a radio frequency carrier.