re 2nd Aug 2014 06:43 ole ole
agree that window frame parts are broken, not cut. Either an aluminium machined forging or titanium machined forging. Had it been any kind of ' cut', the edges would be relatively smooth. The granular structure of the surface is the best clue to breakage. In other venues, a first look at the broken edge would also be somewhat typical of a fatigue break- which was obvioulsy NOT the cazse here.