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History of the manufacturer  

Balder Radio Corp.

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Name: Balder Radio Corp.    (USA)  
Abbreviation: balder
Balder Radio Corp.; New York City - Trade name Knickerbocker

Some models:
Country Year Name 1st Tube Notes
USA  31 633A 36   
USA  31 633C 36   
USA  31 635A 35  4 or 6 tubes? 
USA  31 635C 35  4 or 6 tubes?