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Radiola network lamp "Riga-T 689" developed in 1946, the Riga plant "Radio Engineering". Radio "Riga T-689" may be this one, perhaps in a different version was developed by the design department of the plant "Radio Engineering". An experimental series was released, but the model did not go into mass production, only the eponymous receiver was produced. On the basis of it, many self-made radios have been created, there is information on this site on the "Old Radio".