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1898 the first wireless telegraph news paper message
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1903 radios first news broadcast
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1912 regulating the radio industry
required licence for most priviate radios -
1917-1919 private radios shut down
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1922 "broadcasting boom"
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1927 a second national network formed
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1928-1929 ten minute news casts
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1931 "The University of Chicago Roundtable" broadcast by NBC
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1933 two thirds of americans own a radio
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1934 radio industry into a handful of large corporations.
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1939-1945 covered daily events of WW2
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1945 started interviewing celebs
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early 1960's all talk radios
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1970 national public radio