Phillps data and Handbook  pt. 9, electron tubes-transmitting tubes for communication and triodes for R F heating, associated accessories 
Philips Gloeilanapenfabrieken 
 - Netherland  Technical Publications Department  1969 
 - [various pagings.] 
<br/><br/><label>ISBN: </label>9399-241-11601 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electron Tubes<br/>Electronics<br/>NASA Thesaurus
<br/><br/><label>Universal Decimal Class. No.: </label>(035)621.38  / PDH-69:9