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Telegraph Samuel Morse
It is no longer a major means of commercial or maritime communications, but it is still used by amateur radio operators. -
Computer Charles Babbage
It is an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program. -
Telephone Alexander Graham Bell
It is an instrument for reproducing sounds at a distance specifically : one in which sound is converted into electrical impulses for transmission (as by wire or radio waves) telephone -
Radio Guillermo Marconi
Radio is sound communication by radio waves, usually through the transmission of music, news, and other types of programs from single broadcast stations to multitudes of individual listeners equipped with radio receivers. -
Television Philo Farnsworth
Telegram television (also known as a TV) is a machine with a screen. Televisions receive broadcasting signals and change them into pictures and sound. -
Mobile phone Martin Cooper
It is a telephone with access to a cellular radio system so it can be used over a wide area, without a physical connection to a network. -
Tablet Jeff Hawkins
Tablets can be used to browse the Internet, check email, download and read books, play games, watch videos, organize content, and much more.