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Bowed string instruments are a subcategory of string instruments that are played by a bow rubbing the strings. The bow rubbing the string causes vibration which the instrument emits as sound.
Despite the numerous specialist studies devoted to the origin of the bowing the problem of the origin of the bowing is unresolved 
Some say that the bow was introduced to Europe from the Middle East  while others say the bow was not introduced from the Middle East, but the other way round, that that the bow may have had its origin from a more frequent intercourse with North Europe and Western Europe  
The following instruments are sounded by means of a turning wheel that acts as the bow.
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