Heyboer, J P <br/><br/>
Transmitting valves  The use of pentodes, tetrodes and triodes in transmitter circuits 
by J P Heyboer, P Zijlstra 
 -  Philips Tech Lib  1951 
 - xii, 286p 
<br/><br/><label>Dewey Class. No.: </label>621.384132  / N51