jose luis herrera lozada
Category: Иное
Обновлено: 11 окт 2017
linea del tiempo
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Created byLuis Edko Herr
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События
5000 A.C. prehistoryPrehistoric man communicated through grunts and other sounds3000 A.C Egyptiansrepresented the ideas through symbols430 D.C.The Romans used torches (telegraphic optical system)in 1500 AZTECSthe communication was by means of messages written and carried by men on footThe Indians of North America made use of smoke signalsTelegraphic Optical Systems (use of flags, or traffic lights)in April 3 of 1860 the Communication was by horsesThe United States launches Western Union's Westar I & II satellites.in 1976 started the first Super TV Stationin 1979 The INMARSAT consortium (INternational MARitime SATellite organization)in 1981 CELULAR TELEPHONY is bornThe first HDTV formats are bornin 1985 Mexico launches its first satellite called Morelosin 1989 The second Mexican satellite Morelos IIin 1993 in the United States begins the cellular telephony with digital technology.Some
event
happenedOn June 7, 1995, the Federal Telecommunications Law was published in Mexico.It was 25 years in the United States of the first commercial cell phone serviceFebruary 7, 2009 The United States turns off analogue television to make way for Digital Television.
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