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Radiola was an RCA product and RCA was born the radio pattent holding company/ bastard child of GE and Westinghouse...from the beginning up to WWII there were a number of RCA products that got sold as GE and or Westinghouse products with only a moderate cabinet restyle to mask it... I'd look at GE and Westinghouse first as they were more copy cats than anyone you mentioned. Philco hated RCA so much they used Loctal tubes (which were a Sylvania pattent IIRC) instead of Octals which were an RCA pattent... Philco was no copy cat of RCA...Heck in that era it was the other way around. RCA was forced to copy the successful concept of the budget Philco 80 cathedral radio.
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