Timeline
1901	Guglielmo Marconi's "wireless" telegraph sends a signal in Morse code a distance of 2,000 miles.
1904	Sir John Ambrose Fleming invents the vacuum tube and diode.
1906	Lee De Forest develops the triode.
1912	Edwin Howard Armstrong devised one of the first effective amplitude modulation (AM) radio receivers.
1920	The first modern commercial radio station, KDKA in Pittsburgh, begins broadcasting.
1925	John Baird succeeds in transmitting a recognizable image.
1926	Charles Jenkins set up the first intercity television transmission in the United States by wire.
1927	Philo T. Farnsworth transmits first television image.
1928	Color television.
1930	Vladimir Zworykin of RCA devises superior television camera.
1933	Edwin Howard Armstrong invents frequency modulation (FM).
1947	John Bardeen, Walter H. Brattain, and William B. Shockley of Bell Telephone Laboratories invent the transistor.
1950s	Rectangular cathode-ray tube perfected.
1954	Regular broadcasts of color television.
1954	Transistor radio introduced.
1958	Jack Kilby of Texas Instruments invents the integrated circuit (IC).
1960s	Solid state imaging devices first demonstrated.
1968	200 million televisions worldwide.
1980s	Miniaturized televisions.
1990s	Liquid crystal display panels (LCD), high definition television (HDTV).