I love that ads in the back.  In particular, look at page 446: HRO receiver from National.  This radio was picked up by the military for world war II and remained in production for 29 years:<p><a href="http:&#x2F;&#x2F;www.cryptomuseum.com&#x2F;df&#x2F;hro&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.cryptomuseum.com&#x2F;df&#x2F;hro&#x2F;</a>
<a href="http:&#x2F;&#x2F;www.radioblvd.com&#x2F;National%20HRO.htm" rel="nofollow">http:&#x2F;&#x2F;www.radioblvd.com&#x2F;National%20HRO.htm</a>