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Closed-circuit radio : ウィキペディア英語版 | Closed-circuit radio A closed-circuit radio is a radio that emits over a very small range, typically a college campus. This system can be achieved from two ways: *By tying into the PA System〔(Radio Industry: closed circuit radio station, school radio station, college dormitories )〕 *By using existing power lines, telephones lines, pipes, etc. to transmit a carrier current〔(The early days of armed forces radio )〕 ==References==
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「Closed-circuit radio」の詳細全文を読む
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