"Rebecca/Eureka transponding radar" . . . "Rebecca radio set" . "Rebecca" . "Rebecca/Eureka" . . "Eureka beacon" . "Eureka beacons" . "radar that could find the beacons dropped" . "Rebecca/Eureka transponding radar" . "radio beacons" . "Eureka" . "Eureka radar sets" . . "REBECCA" . "Eureka radar transponder beacons" . "Lucero system" . . "Eureka radio beacons" . "Rebecca beacon-interrogation distance-measuring equipment" . . "Eureka signal" . . "Rebecca and Eureka" .