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200 1 $aData and circuits of radio receiver and amplifer valves$esecond supplement$fcompiled and edited by N. S. Markus, J. Otte
210   $aEindhoven$cPhilips technical library$d1952
215   $a487 p.$cill.$d23 cm
225 1 $aSeries on electronic valves$v2
700  1$aMarkus,$bN. S.
701  1$aOtte,$bJ.
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