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		 Years ago i made a little device that clipped to the side of a mouse.  It was just clear plastic with a cross hair sight in it that stuck on with velcro.  You could use it to trace cartoons etc.  It wasnt very good and I think I was about 10 when i did it.  Low and behold, a few years later I noticed a little device being sold in an Amiga magazine that was identical in concept.  Sure, it wasnt a copy of my design, but it was lol. 
		
		
		
		
		
		
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