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History of the manufacturer  

Belltone = Tube brand

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Name: Belltone = Tube brand    (USA)  
Abbreviation: belltone1
Products: Brand

Page 352 of Tyne's book "Saga of the Vacuum Tube", the Belltone tube was advertised by 
Radio Tube Laboratory, 296 Broadway New York - 1924.
It further states that the company also made Cleartron tubes. (Page 353 of Tyne states that Cleartron tubes were made from 1925) 

Founded: 1924

This manufacturer was suggested by Fin Stewart.


Further details for this manufacturer by the members (rmfiorg):

Radio World 12th March 1925tbn_belltone_rw12325.jpg