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Is there a free cad or similar program that would be good for making drawings that will be submitted as part of a patent application?

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Good start for hunting could be alternativeto.net. Unfortunately, I don't have any real world experience on those, but at least it's a start :-) – koiyu Jul 29 '11 at 19:26

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Could you use Google SketchUp perhaps?

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SketchUp is a very capable CAD option. And Free (tho the paid version is well worth it if you end up using it a lot). – DA01 Sep 18 '11 at 2:33

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