Mobile phone - Martin CooperIt is a portable device that can make or receive calls through a radio frequency carrier, while the user is moving within a telephone service area.
Tablet - Alan KayIt is a portable electronic device larger than a phone, it is a single piece that integrates a touch screen that emits light and with which it interacts primarily with the fingers or a stylus, without the need for a physical keyboard or mouse .
Computer - Charles BabbageIt is a programmable digital electronic machine that executes a series of commands to process the input data, conveniently obtaining information that is subsequently sent to the output units. A computer is physically made up of numerous integrated circuits and various support, extension, and accessory components, which together can perform various tasks extremely quickly and under the control of a program (software).
Television - Jhon Logie BairdTelevision is a system for the transmission and reception of images and sounds at a distance that simulate movements, which uses a diffusion mechanism. The transmission can be carried out by means of radio waves, by cable television networks, satellite television, which are those that exist in open signal and subscription television modalities.
Radio - Heinrich HertzIt is a means of communication that is based on the sending of audio signals through radio waves, although the term is also used for other forms of remote audio transmission such as Internet radio.
Telephone - Alexander Graham BellThe telephone is a telecommunication device created to transmit acoustic signals at a distance by means of electrical signals.
Telegraph - Samuel MorseThe telegraph is a device or device that uses electrical signals to transmit coded text messages, such as Morse code, over wire lines or radio communications.