I worked for Plessey, when barcodes were first introduced in Sainsbury's for stock ordering. I used to visit branches across southern England to maintain the datacapture trolley's. Product barcodes were located on the shelving below the items. Staff would do a daily stock check, scanning the barcode for items that needed replenishing. The information was recorded on a cassette tape in the trolley, and was transmitted in the evening via a 1200Bd transmitter to Blackfriars. Later the barcodes were also used for shelf checking to ensure the price displayed on the shelf corresponded with that being charged at checkout.
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