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Telegraph- David Alter
A telegraph is a device for transmitting and receiving messages over long distances. -
Telephone- Alexander Graham Bell
It is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. -
Radio- Guglielmo Marconi
Radio is the technology of signaling and communicating using radio waves -
Television- John Logie Baird
An electronic system of transmitting transient images of fixed or moving objects together with sound over a wire or through space by apparatus that converts light and sound into electrical waves and reconverts them into visible light rays and audible sound -
Computer- Charles Babbage
Is a machine that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming. -
Mobile phone- Martin Cooper
Is a small portable radio telephone. The mobile phone can be used to communicate over long distances without wires. -
Tablet- Alan Kay
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.
