Plessey code is most often used for retail grocery shelf marking and in libraries. It originated in Europe, and from it, several variations have emerged. The modified Plessey code continues to be used in the United States. While the Plessey code is sometimes grouped with numeric-only barcodes, it should be included in the alpha-numeric group as it is capable of encoding digits 0 through 9 as well as the letters A through F.
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