標準電波（電波時計）の運用状況
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おおたかどや山標準電波送信所（40 KHz）
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はがね山標準電波送信所（60 KHz）
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Copyright(C) 2005 National Institute of Information and Communications Technology. All Rights Reserved.
Copyright(C) 2005 National Institute of Information and Communications Technology. All Rights Reserved.