| 摘要 |
The product comprises an imager ( 21 ), a coded data source ( 11 ), and a variable property having a first use, with light emanating from the coded data source ( 11 ) representing the first use and specifying which portion of light detected ( 12 ) by the imager ( 21 ) represents the variable property, where the coded data source ( 11 ) can be from a plurality of coded data sources and the imager ( 11 ) can be from a plurality of imagers ( 21 ).
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