SCARBOROUGH, Maine -- Hannaford Bros. here has begun testing a system that locks the wheels of its shopping carts automatically if they are taken from its parking lots, according to Brett Osterfeld, a spokesman for the maker of the system. The technology, from Gatekeeper Systems, Irvine, Calif., is being used in four Hannaford stores. It uses an underground antenna along the perimeter of the lot that transmits a low-frequency radio signal to a locking device within the wheels of the carts. ...

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