A price display system for a store includes spread spectrum radio broadcasting of UPC and price data from a transmitter in the store to a large number of receivers. Each receiver is connected to one or more LCD displays attached to the store shelves, and each receiver provides the relevant information...http://www.google.com.au/patents/US5198644?utm_source=gb-gplus-sharePatent US5198644 - System for display of prices and related method
