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en.wikipedia.org/wiki/History_of_radio

In June 1912 Marconi opened the world's first purpose-built radio factory at New Street Works in Chelmsford, England. The first radio news program was broadcast August 31, 1920 by station 8MK in Detroit, Michigan, which survives today as all-news format station WWJ under ownership of the CBS network.

www.radiocom.net/Fessenden

His most remarkable feat here was the World's First Radio Broadcast on Christmas Eve of 1906 and again on New Years Eve, a week later. . Other firsts besides voice over radio was the first two way trans-Atlantic radio communications, first voice heard across an ocean. First to use 'sine waves' in radio as we do today.

www.wired.com/2010/08/0831first-radio-news-broadcast

1920: A Detroit station airs what is believed to be the first radio news broadcast. The exact headlines of that day are of no historical significance, but with this local newscast a nascent medium ...

en.wikipedia.org/wiki/Birth_of_public_radio_broadcasting

The birth of public radio broadcasting is credited to Lee de Forest who transmitted the world’s first public broadcast in New York City on January 13, 1910. This broadcast featured the voices of Enrico Caruso and other Metropolitan Opera stars. Members of the public and the press used earphones to listen to the broadcast in several locations throughout the city.

xroads.virginia.edu/~ug00/3on1/radioshow/1920radio.htm

Emergence of Radio in the 1920s and its Cultural Significance. Most radio historians asert that radio broadcasting began in 1920 with the historic broadcast of KDKA. Few people actually heard the voices and music which were produced because of the dearth of radio receivers at that time.

www.youtube.com/watch?v=dMujQke4mMo

"On November 2, 1920, station KDKA made the nation's first commercial broadcast... They chose that date because it was election day, and the power of radio was proven when people could hear the ...

www.youtube.com/watch?v=HC_mgp6BJtU

KDKA Pittsburgh lights up the airwaves, announcing the winner of the presidential race in 1920. Visit HistoryBuff.com for more!

www.pbs.org/wgbh/aso/databank/entries/dt20ra.html

The voice was that of Reginald Fessenden (1866-1932), an inventor and engineer who had been working on producing voice radio since Marconi's first wireless broadcast across the Atlantic. After his ...

www.britannica.com/topic/radio

Audiences were enthralled as radio became a national craze. Magazines, books, and even movies featured or included references to radio broadcasting. Most other industrial nations began radio broadcasts by the mid-1920s. France (in Paris) and the Soviet Union (in Moscow) aired broadcasts in 1922. The first continuing Chinese radio station ...

www.history.com/topics/inventions/guglielmo-marconi

Italian inventor and engineer Guglielmo Marconi (1874-1937) developed, demonstrated and marketed the first successful long-distance wireless telegraph and in 1901 broadcast the first transatlantic ...