WOR radio’s transmitter room 

The beginning of the CBS radio network dates back toJanuary 21, 1927, with
the creation of the "United Independent Broadcasters" network in Chicago by
New York talent agent Arthur Judson. The young network was soon in need
of additional investors, and that’s when the Columbia Phonograph Company, manufacturers of Columbia Records, came to the rescue in April 1927; as
a result, the network was renamed "Columbia Phonographic Broadcasting
System". Columbia Phonographic went on the air on September 18, 1927,
with a presentation by the Howard Barlow Orchestra from flagship station
WOR in Newark, New Jersey, along with fifteen affiliates.