| http://www.w3.org/ns/prov#value | - A window, particularly for installation in an inclined roof surface, having an opening angle and comprising a main frame (1) having a top and a frame (3,4) hinged to the top thereof as well as a frame lifting arm (5) inserted between the main frame and the frame, said arm having two ends, one end pivotally connected with a lateral member of one of the main frame and the frame, and its other end pi
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