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ELECTRONIC SHELF-MOUNTING INFORMATION DISPLAY MODULES; ELECTRONIC SHELF-MOUNTING INFORMATION DISPLAY AND STORAGE MODULES; ELECTRONIC SHELF-MOUNTING RADIO BROADCASTING/RECEIVING INFORMATION DISPLAY AND STORAGE MODULES; RADIO BROADCASTING/RECEIVING SYSTEM CONTROL UNITS FOR USE WITH SUCH MODULES; COMPUTER PROGRAMS FOR USE WITH SHELF-MOUNTED, COMPUTER-OPERATED, IN-STORE, INFORMATION DISPLAY NETWORKS; INTERFACE UNITS EACH LINKING AN ELECTRONIC STORE PRICE SCANNING SYSTEM AND A SYSTEM CONTROL UNIT; RADIO BROADCASTING/RECEIVING ANTENNAE ARRAYS; MODULE ACTIVATION AND TEST UNITS