Object's details: Urządzenie do odbiorników radjoelektrycznych, zapobiegające przewzbudzaniu ich : opis patentowy : nr 15061 : Kl. 21 a⁴ 69
Provider:Polona
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Układ odbiorczy z wytwarzaniem częstotliwości dudnień : opis patentowy : nr 22449 : Kl. 21 a⁴, 24/01
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