http://siliconjunction.blogspot.co.uk/2013/08/ordering-pcbs-from-itead-studio.html
http://support.iteadstudio.com/support/solutions/articles/1000156317-gerber-files-requirements
https://www.itead.cc/blog/how-to-generate-gerber-files-from-kicad
David Pilling's Wiki
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