Object's details: Układ połączeń do prostowania drgań wielkiej częstotliwości : opis patentowy : nr 22447 : Kl. 21 a⁴, 29/07
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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