Redirect Notice
 The previous page is sending you to http://ja.wikipedia.org/wiki/%E5%95%86%E7%94%A8%E9%9B%BB%E6%BA%90%E5%91%A8%E6%B3%A2%E6%95%B0#50Hz.E3.81.A860Hz.E3.81.AE.E5.A2.83.E7.95.8C.E7.B7.9A.

 If you do not want to visit that page, you can return to the previous page.