avances tecnologicos By carlos_alvaro Sep 22, 2016 computadoras de valvula de vacio 1937 Sep 22, 2016 primer telefono en 1876 Sep 22, 2016 valvula o tubo electrico 1904 Sep 22, 2016 television a color 1940 Sep 22, 2016 horno de microondas 1946 Sep 22, 2016 reloj atomico 1948 Sep 22, 2016 plancha a vapor 1955 Sep 22, 2016 internet 1985
