Valve and service reference manual 
Mullard Electronic Products Limited                          
 - London  Mullard Electronic Products  1949 
 - 221p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>NASA Thesaurus<br/>Radio Electronics<br/>Radio Engineering<br/>Valves
<br/><br/><label>Universal Decimal Class. No.: </label>621.385.1  / MUL