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CAD_Signature_Free For AutoCAD 3.3 SummerCAD    

... drawing that's been signed off by the Chief Architect or Engineer, you can be fairly certain the drawing hasn't been modified since it was released. But if someone sends you an electronic version of the drawing file, how do you know if it's valid? Maybe it's been changed since it .... Free download of CAD_Signature_Free For AutoCAD 3.3

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