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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Extension bell ： ウィキペディア英語版 Extension bell An extension bell or extension ringer〔(【引用サイトリンク】 title=Telephone extension ringers ) 〕 is a device that generates a sound to indicate an incoming telephone call, but is not included in a telephone set itself. Extension bells may be louder than ordinary telephone ringers. As such they may be used by persons with moderate hearing impairment to help them detect incoming telephone calls, especially when they are outside the telephone's room.〔(【引用サイトリンク】 title=Hearing / ROHIs )〕 The devices were in use by the late 19th century. An early Australian system at Mount Crosby, Queensland featured an extension bell which was connected to an engineer's telephone over a distance of a quarter mile.〔 Column 1.〕 ==Further reading== * 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「Extension bell」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.