000			00390nam a2200169Ia 4500
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040			_aMAIN
041			_aEnglish
082			_a621.384 _bRAD
245			_aRadio valve data
260			_aLondon _bILIFFE books _c1949
300			_a230p.
650			_aEngineering
650			_aRadio engineering
942			_cBK
999			_c37625 _d37625