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AN EXCELLENT ORIGINAL WW 2 AIRCRAFT RADIO DIRECTION FINDER LOOP MODEL DU-1 COMPLETE WITH TUBES STAMPED ON BRASS TAGS " COUPLER UNIT TYPE CRR-50061 MANUFACTURED FOR NAVY DEPARTMENT BUREAU OF SHIPS BY BENDIX RADIO CORP.BALTIMORE,MD. " AND " RADIO DIRECTION FINDING EQUIP. MODEL DU-1 " ALL SWITCHES AND CONTROL MOVE FREELY ,FREE SHIPPING IN US