00349nam a2200133Ia 4500008004100000041000800041084001400049100001900063245005500082260003500137653001700172653001600189653001000205160808s1952    xx            000 0 eng d  aeng  aD65432CC  aNorris, Roy C.  aPractical radio reference book /cby Roy C. Norris  aLondon :bOdhams Press,c1952.  aElectrionics  aEngineering  aRadio