| http://www.w3.org/ns/prov#value | - As a result, there is a problem in that it is impossible to obtain a largequantity of power from such a conventional device.DISCLOSURE OF THE INVENTIONTherefore, the present invention has been made in view of the above mentioned problems involved with the conventional device, and an object of the invention is to provide a windmill blade capable of varying the wind pressure receiving areathereof de
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