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Computer - Charles Babbage
A computer is a computing device that is capable of receiving, storing and processing information in a useful way. -
Telegraph - David Alter
A telegraph is any device or system that allows the transmission of information by coded signal over distance. -
Telephone - Alexander Graham Bell
A telephone is device that allows two or more users to have a conversation when they are too far apart to be heard directly. -
Radio - Guillermo Marconi
A radio is a means of communication that is based on the sending of audio signals through radio waves. -
Television - Philo Farnsworth
A television is an electronic system of transmission of images and sounds at a distance by means of Hertzian waves. -
Tablet - Alan Kay
A tablet is a mobile computing device in which the touch screen occupies almost its entire size and in which there is no physical keyboard. -
Mobile Phone - Martin Cooper
A mobile phone is an electronic wireless device that allows access to the mobile phone network.