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National
       Westinghouse                          Philips Miniwatt        RCA  

 ITT            General Electric    Mullard
 
USA, Fivre    Sylvania   JAN Philips ECG   UK - British Army
    


Teonex - England              Sonotone                Brimar

Siemens         TELEFUNKEN                           EIMAC      



....
e molte altre..




                                                                 

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