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History of the radio manufacturer Keystone Radio Service, Philadelphia
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Name: Keystone Radio Service, Philadelphia    (USA)    
Abbreviation: keyst-rase  
Products: model-types  
Summary: Keystone Radio and Electric Service, 6237 Haverford Ave., Philadelphia, PA.
Superheterodyne kits, Radio frequency kit sets, Radio frequency transformers for any type of set.

Radio Coll. Guide 1921-1932 notes the name without "and Electric".

Ref.: The Radio Trade Directory, Aug.,1925.
 

 
History:  

     
Some models:
Ctry  Year  Name  1st Tube  Notes
USA  25  Ultradyne L2 UV201A 97$  UV201A  The Ultradyne L2 was first manufactured for the UV201A with thoriated filament, which was ... 
USA  25 / 26 Ultradyne L2 UX201A 99$  UX201A  The Ultradyne L2 was first manufactured for the UV201A with thoriated filament, which was ... 
USA  25  Kit      
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Further details for this radio manufacturer by the members (rmfiorg):

 
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