| http://www.w3.org/ns/prov#value | - An optical scanner comprising a hand-holdable housing including:a scanner head for scanning a record medium; a roller engageable with and rotatable by said record medium when scanned by said scanner head, said roller including an optically-sensible marking for use in measuring rotary movements of the roller; a light source illuminating said roller and said marking thereof; an optical sensor for se
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