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1920:
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The first broadcasting stations are opened.
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1920:
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First cross-country airmail flight in the U.S.
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1920:
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Sound recording is done electrically.
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1920:
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Post Office accepts the postage meter.
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1920:
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KDKA in Pittsburgh broadcasts first scheduled programs.
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1921:
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Quartz crystals keep radio signals from wandering.
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1921:
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The word "robot" enters the language.
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1921:
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Western Union begins wirephoto service.
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1922:
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A commercial is broadcast, $100 for ten minutes.
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1922:
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Technicolor introduces two-color process for movies.
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1922:
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Germany's UFA produces a film with an optical sound track.
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1922:
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First 3-D movie requires spectacles with one red and one green
lens.
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1922:
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Singers desert phonograph horn mouths for acoustic studios.
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1923:
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Zworykin's electronic iconoscope camera tube and kinescope
display tube.
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1923:
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People on one ship can talk to people on another.
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1923:
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Ribbon microphone becomes the studio standard.
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1923:
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A picture, broken into dots, is sent by wire.
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1923:
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16 mm nonflammable film makes its debut.
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1923:
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Kodak introduces home movie equipment.
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1923:
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Neon advertising signs.
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1924:
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Low-tech achievement: notebooks get spiral bindings.
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1924:
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The Eveready Hour is the first sponsored radio program.
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1924:
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At KDKA, Conrad sets up a short-wave radio transmitter.
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1924:
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Daily coast-to-coast air mail service.
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1924:
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Pictures are transmitted over telephone lines.
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1924:
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Two and a half million radio sets in the U.S.
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1925:
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The Leica 35 mm camera sets a new standard.
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1925:
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Commercial picture facsimile radio service across the U.S.
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1925:
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All-electric phonograph is built.
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1925:
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A moving image, the blades of a model windmill, is telecast.
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1925:
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From France, a wide-screen film.
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1926:
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Commercial picture facsimile radio service across the Atlantic.
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1926:
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Baird demonstrates an electro-mechanical TV system.
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1926:
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Some radios get automatic volume control, a mixed blessing.
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1926:
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The Book-of-the-Month Club.
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1926:
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In U.S., first 16mm movie is shot.
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1926:
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Goddard launches liquid-fuel rocket.
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1926:
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Permanent radio network, NBC, is formed.
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1926:
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Bell Telephone Labs transmit film by television.
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1927:
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NBC begins two radio networks; CBS formed. 1927: Farnsworth
assembles a complete electronic TV system.
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1927:
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Jolson's "The Jazz Singer" is the first popular "talkie."
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1927:
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Movietone offers newsreels in sound.
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1927:
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U.S. Radio Act declares public ownership of the airwaves.
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1927:
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Technicolor.
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1927:
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Negative feedback makes hi-fi possible.
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1928:
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Baird demonstrates color TV on electro-mechanical system.
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1928:
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The Teletype machine makes its debut.
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1928:
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Television sets are put in three homes, programming begins.
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1928:
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Baird invents a video disc to record television.
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1928:
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In an experiment, television crosses the Atlantic.
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1928:
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In Schenectady, N.Y., the first scheduled television broadcasts.
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1928:
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Steamboat Willie introduces Mickey Mouse.
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1928:
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A motion picture is shown in color.
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1928:
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Times Square gets moving headlines in electric lights.
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1928:
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IBM adopts the 80-column punched card.
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1929:
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Experiments begin on electronic color television.
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1929:
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Telegraph ticker sends 500 characters per minute.
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1929:
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Ship passengers can phone relatives ashore.
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1929:
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Brokers watch stock prices on an automated electric board.
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1929:
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Something else new: the car radio.
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1929:
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In Germany, magnetic sound recording on plastic tape.
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1929:
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Television studio is built in London.
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1929:
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Air mail flown from Miami to South America.
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1929:
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Bell Lab transmits stills in color by mechanical scanning.
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1929:
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Zworykin demonstrates cathode-ray tube "kinescope" receiver, 60
scan lines.
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