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Computer-Charles Babbage.
The first digital computers were used primarily for scientific calculations. -
Telegraph-Sir William Fothergill Cooke and Sir Charles Wheatstone.
The telegraph was first used to transmit messages over relatively short distances, like in the same city. -
Telephone-Antonio Meucci
A membrane vibrated with the voice. When the membrane and the metal piece came into contact to vibrate, an electromagnet located next to it varied its magnetic field, inducing an electric current. -
Radio-Guillermo Marconi
Guillermo Marconi maked the first transmition by radio. The radio helped a lot in the first world war to communicate with the front lines -
Television-John Logie Baird
It was an electronic device for the reception and reproduction of television signals.. -
Tablet-Alan Kay
Tablets or tablets use a touch-sensitive screen so you can quickly type and navigate -
Mobile phone-Martin Cooper
The first mobile phone weighed more than 2 kilos and at first it was used for maritime communication.