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なぜちがう周波数ができてしまったの？｜教えて！かんでん｜関西電力
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電源周波数地域（50Hz地域／60Hz地域）について | お知らせ：シャープ
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Utility frequency - Simple English Wikipedia, the free encyclopedia
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電球豆知識(50hz/60hz周波数帯について) 激安特価販売:アカリセンター
