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Broadcasting in the United States : ウィキペディア英語版 | Broadcasting in the United States
Broadcasting in the United States began with experiments with wireless transmission during the middle of the 19th century, with varying degrees of success. These transmissions were initially by radio hobbyists fascinated with the technology. Once techniques were perfected, radio became a necessity for military and commercial users alike. Eventually, broadcasting would come to have a major impact throughout the country. ==History==
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「Broadcasting in the United States」の詳細全文を読む
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