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The Blue Network, and its immediate predecessor, the NBC Blue Network, were the on-air names of an American radio production and distribution service from 1927 to 1945. Tracing its formal origins back to 1927 as one of the two radio networks owned by the National Broadcasting Company, the Blue Network was born of a divestiture in 1942, arising from anti-trust litigation, and is the direct predecessor of the American Broadcasting Company. == Early history == The Blue Network can be dated to 1923, when the Radio Corporation of America acquired WJZ, Newark from Westinghouse (which had created the station in 1921)〔In a publication dated June 1943, the Blue Network itself traced its origins back to the founding of WJZ, as that eventually became the key station of the network. "The Blue Network Today", Blue Network Company, Inc. (New York, 1943), page 1〕 and moved it to New York City in May of that year. When RCA commenced operations of WRC, Washington on August 1, 1923, the root of a network was born, though it did not operate under the name by which it would later become known. Radio historian Elizabeth McLeod states that it would not be until 1924 that the "Radio Group" formally began network operations. The core stations of the "Radio Group" were RCA's stations WJZ and WRC; the Westinghouse station WBZ, then in Springfield, Massachusetts; and WGY, the General Electric station in Schenectady, New York.〔 RCA's principal rival prior to 1926 was the radio broadcasting department of the American Telephone & Telegraph Company. AT&T, starting in 1921, had been using this department as a test-bed for equipment being designed and manufactured by its Western Electric subsidiary. The RCA stations operated at a significant disadvantage to their rival chain; AT&T used its own high-quality transmission lines, and declined to lease them out to competing entities, forcing RCA to use the telegraph lines of Western Union, which were not as well calibrated to voice transmission as the AT&T lines. Nevertheless, the WJZ network sought to compete toe-to-toe with the AT&T network, which was built around WEAF (today's WFAN). For example, both stations sent announcer teams to cover the 1924 Democratic National Convention, which was held in Madison Square Garden in New York City.〔For a colourful description of the radio coverage of this convention by WEAF and WJZ, as well as a reference to the Western Union lines, see 〕 Promotional material produced in 1943 claimed certain "firsts" in broadcasting by WJZ, such as the first educational music program in April 1922, the first World Series broadcasts in 1922, and the first complete opera broadcast, ''The Flying Dutchman'', from the Manhattan Opera House.〔"The Blue Network Today", page 2; it is noteworthy that RCA, then still owner of the Blue Network, gives the credit to itself, and not to Westinghouse, the actual owner at that time.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Blue Network」の詳細全文を読む スポンサード リンク
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