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http://www.neufeld.newton.ks.us/electronics/?p=239
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http://tinymicros.com/embedded/pcbs.html
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http://my.athenet.net/~multiplx/cgi-bin/strip.main.cgi
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http://www.ladyada.net/library/pcb/costcalc.html
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http://www.circuit-electronique.fr
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http://www.makezine.com/blog/archive/...return_of_t.html?CMP=OTC-0D6B48984890
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http://www.divshare.com/download/17686-9d4
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http://www.gedasymbols.org
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http://www.pcbcart.com/cart.php
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http://www.myhome.ch/mzingg/pcbstuff/tps