ocr: SUPERMARKET SCANNER S THE STORE ASSISTANT moves PRODUCT- A, your purchases over the window ofa supermarket scanner, a laser SCANNER beam scans a bar code on each item. WINDOW The code identifies the product - to the store computer which Z41 * - l d displays the price, adds up your bill, and updates the store's stock records. As stocks ofa R - - particular product fall, the computer automatically orders a new supply. BAR CODE LASER. LASER. BEAM SPREADER BEAM SEMI- SILVERED MIRROR E RETURNING BEAM DETECTOR
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