| http://www.w3.org/ns/prov#value | - A device for detecting defects in an article comprising: a source of radiation for providing radiation to said article; detection means for scanning said radiated article and during each horizontal scan producing a first edge signal indicative of one edge of said article, asecond edge signal indicative of an opposite edge of said article and a defect signal in the event there is a defect in said a
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