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UPC Supplemental 2-Digit
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2-digit supplemental bar codes should only be used with magazines, newspapers and other such periodicals. The 2-digit supplement represent the issue number of the magazine. This is useful so that the product code itself (contained in the main bar code) is constant for the magazine such that each issue of the magazine doesn't have to have its own unique bar code.
UPC Supplemental 2-Digit