The Roaring 20s ushered in popular, and more affordable, console radios originally powered by dry-cell B batteries. During this time, Dongan introduced radio voltmeters, amplifier transformers, filament heating transformers and chokes compatible with Raytheon, R.C.A. and Cunningham radio tubes.
The 1920s also marked the emergence of electric toys, including trains. The subsequent demand for transformers to operate trains manufactured by Lionel, American Flyer, Ives and Bing was met with a series of various sized transformer products from Dongan.
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