Object's details: Sposób wyrobu filmu mówiącego i aparat do jego wyświetlania : opis patentowy : nr 14126 : kl. 57 a 57
Provider:Polona
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Urządzenie do zapisywania dźwięków, zwłaszcza na filmie : opis patentowy : nr 18383 : Kl. 42 g, 9/04
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