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| Electric bell ： ウィキペディア英語版 |
Electric bell
An electric bell is a mechanical bell that functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing or clanging sound. Electric bells have been widely used at railroad crossings, in telephones, fire and burglar alarms, as school bells, doorbells, and alarms in industrial plants, but they are now being widely replaced with electronic sounders.
== Types ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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