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System and method for encoding and decoding data and references to data in machine-readable graphical codes Grant 7,428,981 - Hepworth , et al. September 30, 2 | 2008-09-30 |
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System and method for encoding and decoding data and references to data in machine-readable graphical codes App 20060032920 - Hepworth; Paul J. ;   et al. | 2006-02-16 |
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