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Telegraph
The telegraph is a device or device that uses electrical signals for the transmission of encoded text messages -
post mail
is a system dedicated to transporting written documents, as well as packages of small or medium size, parcels around the world -
phone
Is a telecommunication device designed to transmit acoustic signals remotely by means of electrical signals. -
Radio
It is a means of communication 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. -
TV
Is a system for transmitting and receiving images and sound at a distance that simulate movement, which uses a diffusion mechanism. -
computer
is a digital machine that reads and performs operations to convert them into convenient and useful data that are subsequently sent to the output units -
mobile phone
is a portable telephone that can make and / or receive calls through a radiofrequency carrier, while the user is moving within a telephone service area. -
ARPANET becomes Internet
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Facebook
Is an American company that offers social networking and social media services online based in Menlo Park, California.
