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Telegraph - David Atler
The telegraph is a system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electrical connection. -
Telephone - Alexander Graham Bell
A telephone 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 - Guillermo Marconi
A radio is a box filled with electronic components that catches radio waves sailing through the air and converts them back into sounds your ears can hear. -
Television - John Logie Baird
Television is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in color, and in two or three dimensions and sound. -
Computer - United states Navy
A computer is a machine that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming. -
Tablet - Alan Kay
A 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. -
Mobile Phone - Martin Cooper
A mobile phone 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.
