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Canon Scanner – Unable to Open TWAIN Source - Ask Garth
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Amazon.com: Canon imageFORMULA R40 Office Document Scanner Receipt Edition, for PC and Mac, Scan & Extract Data to QuickBooks Online, Color Duplex Scanning, Auto Document Feeder, Easy Setup for Office Or Home
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Canon Knowledge Base - DR Scanner driver not found / TWAIN Error
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Canon Scanner – Unable to Open TWAIN Source - Ask Garth
Canon Scanner -- Unable to open TWAIN source - YouTube
