Object's details: Elektromagnetyczne urządzenie, rejestrujące i odtwarzające drgania akustyczne : opis patentowy : nr 14525 : Kl. 42 g 17
Provider:Polona
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Urządzenie do nagrywania, kopjowania i odtwarzania dźwięków : opis patentowy : nr 14708 : Kl. 42 g 2
Creator:Huguenard, Eugène (1881-1968). Autor
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