All are supplied with easy to understand methods and examples of calculating the check character. Code 11 - high density numeric barcode used mostly in labeling telecommunications components. Code 93 - similar to Code 39 but requires two check characters. MSI Plessy barcode was designed by the Plessy Company in England and has been used primarily in libraries and retail applications such as grocery store shelves. ISBN - ISBN and Bookland are an implementation of the EAN barcode with a 5 digit supplement used on books and periodicals.
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