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I use an HP scanjet N6010 at work. It is a sheet-feeder-only scanner and scans both sides in a single pass. If you run 300dpi b/w it is very fast, with higher resolution or with greyscale and color it drops down in speed considerably.
The problem is the feeder mechanism. I have yet to find any cut sheed feeder that does not jam or pull multiple pages. That's why printing presses lift each sheet with vacuum from the stack and then feed it into the machine rather than relying on some roller friction
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