MAKE: Blog: Graffiti Research Lab » L.A.S.E.R. Tag (and HOW TO)...
<BR><A href='http://www.makezine.com/blog/archive/2007/02/graffiti_resear.html?CMP=OTC-0D6B48984890'>http://www.makezine.com/blog/archive/2007/02/graffiti_resear.html?CMP=OTC-0D6B48984890</a> 
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