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THE TELEGRAPH
Samuel Morse. Telegraphy is the long-distance transmission of textual messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. -
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FIXED TELEPHONE
1860 - Antonio Meuci.
1876 - Graham Bell. A telephone or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user. -
RADIO
Gugliermo Marconi. He built the first commercially successful complete wireless telegraphy system based on airborne hertzian waves (radio transmission). Marconi demonstrated the application of radio in military and marine communications and started a company for the development and propagation of radio communication services and equipment. -
TELEVISION
Philo Taylor Farnsworth y Vladímir Zvorykin. The first public television broadcasts were made by the BBC in England in 1927 and by CBS and NBC in the United States in 1930.
The development of telephotography reached its peak with tele-enrolment, and its transmission system. These devices allowed the daily newspaper to be received at the customer's home, by printing it from a specialized station. -
MOBILE PHONE
Martin Cooper. While the transmission of speech by radio has a long history, the first devices that were wireless, mobile, and also capable of connecting to the standard telephone network are much more recent. The first such devices were barely portable compared to today's compact hand-held devices, and their use was clumsy.
