Could be -- but see URL:
http://www.io.com/~nielw/nat_list/hro_sr.htm

This very early HRO Model circa 1934 covered 1.7 to 4.0 mc.
3.5 to 7.3 mc.
7.0 to 14.4 mc.
14.0 to 30.0 mc.



Then there is the HOR story --- URL:

http://webhome.idirect.com/~jproc/ve3fab/hro.html

Just Guessin
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"Brenda Ann" wrote in message
...

"RFCOMMSYS" wrote in message
...
Why are the old National radios with coil racks called "HRO"? Was it
just
National's model number prefix or is HRO an abbreviation for something?
And
what was it about the tuning mechanism that was supposedly so great?
(That
tuning knob looks really cool).

HRO is, IIRC, an abbreviation for Ham Radio Only, receivers that are set
up
only to receive the amateur bands (80, 40, 20, 15, 10 meter bands).