1939

• Television is introduced at the New York World’s Fair.
• RCA, GE, DuMont, Philco and two other companies sell the first television sets.
• The first experimental FM stations go on air.

1938

• Konrad Zuse invents the first binary computer.
• Al Gross invents the walkie-talkie.

1937

• Chester Carlson invents the xerographic copy method, but it will be 22 years before the first commercial Xerox Corp. photocopy machine is introduced.
• John Atanasoff begins work on the first electronic computer, completed in 1939.

1936

• The Berlin Olympics are televised.

1934

• The Federal Communications Commission (FCC) is established.

1933

• Howard Armstrong patents FM radio.

1932

• Guglielmo Marconi discovers microwaves.

1931

• Binaural," better known as stereo recording, is invented separately by Alan Blumlein in England and A.C. Keller of Bell Labs.

1930

• I.G. Farben AG develops magnetic plastic audio recording tape in Germany.