‰ NOW 15 WPM ‰ TEXT IS FROM SEPTEMBER 2018 QST PAGE 81 ‰ DURING THE WAR YEARS. AFTER THE END OF WORLD WAR II, SEVERAL MORE MODELS OF THE HRO SERIES WERE MADE, WITH MOST CHANGES CONSISTING OF UPGRADED TUBES AND COSMETIC IMPROVEMENTS. BY THE TIME PRODUCTION OF THE HRO SERIES ENDED, IT HAD ENDURED 30 YEARS OF SUCCESS. THE HRO 60 IN AUGUST 1952, NATIONAL DEDICATED ITS MONTHLY FULL PAGE QST ADVERTISEMENT TO THE INTRODUCTION OF THE HRO 60. ALL THE TUBE TYPE HRO RECEIVERS HAD FEATURES IN COMMON. THEY ALL HAD THE DISTINCTIVE PW MODEL KNOB AND DRIVE MECHANISM. NUMBERS INSIDE ‰ END OF 15 WPM TEXT ‚