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TELEGRAPH- David Alter
The telegraph is an apparatus, system, or process for transmitting messages or signals to a distant place, especially by means of an electric device consisting essentially of a sending instrument and a distant receiving instrument connected by a conducting wire or other communications channel. -
TELEPHONE- Alexander Graham Bell
The telephone is a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals. -
RADIO- Guillermo Marconi
The radio is a means of communication that is based on sending audio signals through radio waves. -
TELEVISION-Philo Farnsworth
The television is a device shaped like a box with a screen that receives electrical signals and changes them into moving images and sound, or the method of sending images and sound by electrical signals. -
COMPUTER- Konrad Zuse
Computers are electronic devices used for a variety of purposes ranging from browsing the web, writing documents, editing videos, creating applications, playing video games,etc. They are designed to execute applications and provide a variety of solutions by combining integrated hardware and software components. -
TABLET- Alan Kay
A tablet is a wireless portable personal computer with a touchscreen interface. The format of the tablet is usually smaller than that of a laptop, but larger than a smartphone. -
MOBILE PHONE- Martin Cooper
A mobile phone is a wireless handheld device that allows users to make and receive calls. While the earliest generation of mobile phones could only make and receive calls, today's mobile phones do a lot more, accommodating web browsers, games, cameras, video players and navigational systems.
