Object's details: Układ wielkiej częstotliwości, przystosowany do fal ultrakrótkich : opis patentowy : nr 20094 : Kl. 21 a⁴, 9/01
Provider:Polona
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Sposób podwajania częstotliwości dla celów fototelegrafji : opis patentowy : nr 10567 : Kl. 21 a⁴ 16
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