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AVIATION GROUND SYSTEM, DESIGNED BY NATIONAL FOR THE CIVIL AERONAUTICS
ADMINISTRATION CAA, WHICH WAS DEVELOPING AIR TO GROUND COMMUNICATIONS TO
SUPPORT THE FLEDGLING AIRLINE INDUSTRY.  SOME WERE ALSO SOLD AS AMATEUR
RECEIVERS, WITH APPROPRIATE COILS.  THE HRO SERIES  SHORTLY THEREAFTER, THE
CAA ASKED NATIONAL FOR A MORE MODERN RECEIVER, AND HAD DETAILED
SPECIFICATIONS INCLUDING PLUG IN COILS THAT COULD ALL BE CHANGED
SIMULTANEOUSLY AND A CRYSTAL FILTER.  MILLEN RECOGNIZED THAT HAMS HAD
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SIMILAR DEMANDS, AND THE HRO SERIES OF RECEIVERS WAS THE RESULT.  RADIO
FOLKLORE SAYS THE NAME HRO WAS AN ACRONYM FOR HELLUVA RUSH ORDER.  THE
FIRST HRO RECEIVER WAS ANNOUNCED IN THE OCTOBER 1934 ISSUE OF QST.  SOON
AFTER, A SCALED DOWN VERSION, THE HRO JUNIOR, WAS OFFERED FOR 100.  AS WAR
BECAME IMMINENT, MILITARY PRODUCTION WAS THE PRIORITY OF ALL MANUFACTURING,
AND NATIONAL WAS NO EXCEPTION.  COUNTLESS THOUSANDS OF HROS WERE PRODUCED
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