Among the few food retailers involved with portable shopping systems, Bloom, a division of Food Lion, Salisbury, N.C., has long offered self-scanning devices that allow shoppers to scan and bag as they go through the store. In March, Bloom began testing another mobile shopping device, known as PAT (personal assistant technology), that is attached to the front of a shopping cart. The test is taking place in one store in Fort Mill, S.C. PAT, which takes the form of a 8.4-inch touchscreen ...

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