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A card reader for color cells, calibration and indicia cells are provided....
http://www.google.ca/patents/US6112991?utm_source=gb-gplus-share
Patent US6112991 - Gray-shade pass card reader
Gray-shade pass card reader
Philip D. Klug
Overview
Abstract
Drawings
Description
Claims
Patent number
: 6112991
Filing date
: 12 Feb 1998
Issue date
: 5 Sep 2000
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