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Computer, Charles Babbage
An electronic machine that is used for storing, organizing, and finding words, numbers, and pictures, for doing calculations, and for controlling other machines. -
Telegraph, Samuel Morse
A method of sending and receiving messages by electrical or radio signals, or the special equipment used for this purpose. -
Telephone, Alexander Graham Bell
A telephone is an instrument designed for the simultaneous transmission and reception of the human voice. Telephones are inexpensive and simple to operate, and they offer an immediate, personal type of communication. -
Radio, Guglielmo Marconi
A piece of electronic equipment used for listening to radio broadcasts -
Television, John Logie Baird
A device shaped like a box with a screen that receives electrical signals and changes them into moving images and sound, or the method or business of sending images and sound by electrical signals -
Tablet, Alan Kay
A small, flat computer that is controlled by touching the screen or by using a special pen. -
Mobile phone, Martin Cooper
A phone that is connected to the phone system by radio instead of by a wire, and can be used anywhere its signals can be received.