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1D Barcodes and 2D Symbols: How are they the same—and different?

If you are already familiar with 1D or linear barcodes such as UPC and Code 128, you will find a lot of familiar things in 2D or Matrix symbologies, but some of those familiar things may be done in unfamiliar ways. Start/Stop Pattern (image on left)  For example, in 1D barcodes there are start/stop patterns that precede and trail the variable encoded...

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