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Telegraph Francis Ronalds
The telegraph is a device used to communicate at a long distance -
The Telephone Antonio Meucci
The telephone is a telecommunication device created to transmit acoustic signals. -
Radio Guglielmo Marconi
Radio is the technology of signaling and communicating using radio waves -
Television John Logie Baird
is a telecommunication medium used for transmitting moving images in color, and in two or three dimensions and sound -
Computer Konrad Zuse
A computer is a machine that can be programmed to carry out sequences of arithmetic or logical operations automatically. -
Mobile phone Martin Cooper
is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area -
Tablet Jeff Hawkins
The tablet is a mobile device, typically with a mobile operating system and touchscreen display processing circuitry, and a rechargeable battery in a single, thin and flat package